Medium LSAT Complete the Argument Questions Practice Questions

Concept Explanation

LSAT Complete the Argument questions require you to identify the most logical conclusion or supporting premise that fills a blank at the end of a stimulus. These questions are essentially a variation of "Must Be True" or "Main Point" questions, where the correct answer choice must flow naturally from the established constraints of the passage. To solve these, you must track the logical direction of the argument—noting whether the final sentence is intended to be a conclusion (indicated by words like "therefore") or a final piece of evidence (indicated by "since" or "because"). Success on Medium LSAT Complete the Argument Questions depends on your ability to avoid choices that introduce new, irrelevant information or shift the scope of the discussion. You are looking for an answer that is strongly supported by the preceding premises and maintains the specific tone and intensity of the passage.

When preparing for the LSAT Prep process, it is helpful to recognize that these questions often use a "bridge" structure. The stimulus sets up two or three premises, and the final blank is the missing link that connects those premises to a logical endpoint. For more practice with complex logical structures, you might also find Hard GRE Reading Exam Questions useful for honing your ability to identify underlying assumptions. Remember that the correct answer is rarely a "shocking" claim; it is usually a conservative statement that the author is forced to accept based on what they have already said.

Solved Examples

1. Example 1: The Economic Paradox
   Stimulus: "If a city increases its minimum wage, businesses may face higher labor costs. However, these same businesses often see an increase in local consumer spending because low-wage workers tend to spend their additional income immediately. Therefore, a modest increase in the minimum wage __________."
   1. Analyze the structure: We have a potential negative (higher costs) balanced by a potential positive (higher spending).
   2. Identify the goal: The word "therefore" indicates we need a conclusion that weighs these two factors.
   3. Evaluate the logic: A modest increase might not necessarily lead to business failure if the spending offset exists.
   4. Correct Conclusion: "...does not necessarily result in a net loss for the local business community."
2. Example 2: The Biological Adaptation
   Stimulus: "Certain deep-sea fish have developed bioluminescent organs to attract prey. However, these same lights make the fish more visible to larger predators. Since the survival of a species depends on the balance between energy acquisition and predator avoidance, these fish would likely not have evolved these organs unless __________."
   1. Analyze the structure: The trait has a benefit (prey) and a cost (predators).
   2. Identify the goal: The phrase "unless" sets up a necessary condition for the evolution of the trait.
   3. Evaluate the logic: For the trait to evolve, the benefit must outweigh the cost.
   4. Correct Conclusion: "...the advantage of attracting prey outweighed the increased risk of being eaten."
3. Example 3: The Artistic Critique
   Stimulus: "Critics argue that the new museum wing is a failure because its modern aesthetic clashes with the surrounding historical buildings. Yet, the primary purpose of the new wing was to provide a climate-controlled environment for fragile tapestries, a goal that the previous architecture could not achieve. Thus, evaluating the wing solely on its visual integration __________."
   1. Analyze the structure: Critics use one metric (aesthetics), but the author provides a different primary goal (functionality).
   2. Identify the goal: "Thus" signals a conclusion about the critics' narrow evaluation.
   3. Evaluate the logic: If the main goal was functional, judging only by looks is incomplete.
   4. Correct Conclusion: "...ignores the functional requirements that dictated its design."

Practice Questions

1. The recent surge in digital book sales has led many to predict the demise of physical bookstores. However, data shows that while digital sales rose, the number of independent bookstores also increased by 15% over the same period. This suggests that the rise of digital media __________.
2. To reduce traffic congestion, the city council proposed a new toll for driving into the downtown core. Opponents argue that this will unfairly burden low-income commuters. However, the revenue from the toll is specifically earmarked to double the frequency of bus routes serving those same low-income areas. Therefore, the net effect on low-income commuters __________.
3. Ethicists argue that if a new technology has the potential to cause significant harm, its release should be delayed until safety can be guaranteed. Yet, delaying the release of life-saving medical AI could result in thousands of preventable deaths while the technology is being refined. This indicates that the ethicists' position __________.

4. Studies show that students who participate in music programs score higher on math tests than those who do not. However, it is also true that schools with well-funded music programs are typically located in wealthy districts with high overall academic funding. This suggests that the correlation between music and math __________.
5. A certain species of butterfly is only found in meadows with a specific type of wildflower. In recent years, the butterfly population has plummeted, even though the wildflower population has remained stable. This implies that the presence of the wildflower __________.
6. Many corporations claim that they prioritize environmental sustainability to appeal to younger consumers. However, these same companies often lobby against environmental regulations that would increase their operating costs. This discrepancy suggests that for these corporations, environmental concerns __________.
7. Psychologists found that people who spend more than four hours a day on social media report higher levels of loneliness. However, the study also noted that individuals who were already lonely tended to seek out social media as a primary means of interaction. Thus, the relationship between social media use and loneliness __________.
8. A major airline recently reduced its ticket prices to compete with low-cost carriers. While the number of passengers increased significantly, the airline's total profit decreased because the cost of fuel and additional staffing exceeded the revenue from the new ticket sales. It follows that increasing the volume of customers __________.

Answers & Explanations

1. Answer: ...does not necessarily come at the direct expense of physical book retailers.
   The stimulus provides evidence of two things happening at once: digital sales going up and independent bookstores increasing. This contradicts the "demise" prediction, leading to the conclusion that the two can coexist.
2. Answer: ...may be less detrimental than opponents of the toll claim.
   The argument presents a negative (the toll) and a counter-benefit (better bus service). The conclusion must reflect the fact that the benefit mitigates the burden mentioned by the opponents.
3. Answer: ...fails to account for the potential harm caused by the delay itself.
   The stimulus sets up a conflict between two types of harm: the harm of the technology and the harm of waiting. The correct answer points out the oversight in the ethicists' logic regarding the cost of inaction.
4. Answer: ...might be explained by a third factor, such as overall school funding.
   This is a classic correlation vs. causation flaw. The stimulus points to a common cause (wealthy districts/funding) for both high math scores and music programs, suggesting the relationship isn't direct.
5. Answer: ...is a necessary but not a sufficient condition for the butterfly's survival.
   If the flower is there but the butterfly is dying, the flower alone isn't enough (not sufficient), even though the butterfly requires it (necessary). This utilizes formal logic often seen in Hard GRE Text Completion exercises.
6. Answer: ...are secondary to the goal of maintaining profitability.
   The conflict between "public claims" and "lobbying against costs" shows that when environmental goals clash with money, money wins.
7. Answer: ...is likely a case of correlation rather than a clear one-way causal link.
   By noting that lonely people seek social media, the stimulus suggests the "cause" could be the reverse of what was initially implied, or a feedback loop.
8. Answer: ...is not a guaranteed method for improving a company's financial bottom line.
   The example shows that more customers (volume) resulted in lower profit, proving that volume alone doesn't equate to success if costs rise too sharply.

Frequently Asked Questions

What is the main goal of an LSAT Complete the Argument question?

The goal is to select the answer choice that most logically completes the passage's train of thought. You must identify whether the blank requires a conclusion, a premise, or a bridge between two ideas based on the context clues provided.

How do I distinguish between a conclusion and a premise in the blank?

Look for indicator words immediately before the blank. Words like "therefore," "thus," and "hence" suggest the blank is a conclusion, while "since," "because," and "for" suggest the blank is a supporting premise.

Can I use my own outside knowledge to fill in the blank?

No, you must rely strictly on the information provided in the stimulus. The correct answer must be a logical extension of the author's stated facts and tone, even if you know additional facts about the topic in the real world.

Why are extreme words like "always" or "never" often wrong?

These words create a very high burden of proof. Unless the stimulus uses similarly strong language, an extreme conclusion is usually unsupported by the relatively moderate premises typical of Medium LSAT Complete the Argument Questions.

What is the best strategy for these questions?

Read the stimulus and try to predict the ending in your own words before looking at the choices. This helps you avoid being distracted by "trap" answers that sound plausible but don't actually follow the specific logic of the passage. Using a tool like the AI Exam Simulator can help you practice this predictive skill under timed conditions.