Logical ReasoningDifficulty: Easy

PT151 S3 Q11 Explanation

Lobbyist: Those who claim that automobile

A free, expert breakdown of this official LSAT Logical Reasoning question.

TopicsParallel Flaw

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Stimulus

Lobbyist: Those who claim that automobile exhaust emissions are a risk to public health are mistaken. During the last century, as automobile exhaust emissions increased, every improved dramatically rather than deteriorated.

What this question is testing

Parallel Flaw

Your task

Break the argument into its conclusion and evidence, then do exactly what the question stem asks with that structure.

Common trap

Answers that sound relevant to the topic but don't connect to the argument's actual reasoning.

Winning move

Predict what a right answer must do, then test each choice against the conclusion-evidence gap.

Reading along? Open the full official question in LawHub — we show a fragment here and keep the reasoning in our own words.

The question
11.

The flaw in the lobbyist’s reasoning can most effectively be demonstrated by noting that, by parallel reasoning, we

Answer choices

  1. Bad Conclusion Match9% picked this

    inspecting commercial airplanes for safety is unnecessary because the number of commercial airplane crashes has decreased

    The conclusion here isn’t anti-causal. It’s saying that “inspecting isn’t necessary”. That’s enough of a mismatch to bail.

  2. Bad Evidence Match2% picked this

    smoking cigarettes is not bad for one’s health because not all cigarette smokers

    The conclusion is anti-causal, but the evidence needs to sound like, “These people smoked cigarettes over a certain time period, and their health measures improved during that time.” The premise in this answer is simply, “some people who smoke don’t get smoking illnesses”.

  3. Correct86% picked this

    using a cell phone while driving is not dangerous because the number of traffic accidents has decreased since the

    Why this is right

    This has the anti-causal conclusion, “Using a cell phone doesn’t cause more dangerous driving”. And it has a premise that says during the time period where cell phones have been present (since the invention of the cell phone), there seems to be [less dangerous driving], since number of traffic accidents have decreased. But just like the original argument, we can argue, “Sure, but the number of accidents would be even lower if people weren’t on their cell phones.”

    Skill tested: Parallel Flaw · how this choice captures the argument's function is the move to repeat next time.

  4. Weak Evidence Match3% picked this

    skydiving is not dangerous because the number of injuries to skydivers has decreased

    This is concluding that skydiving does not cause a dangerous situation. Is its evidence citing a correlation between the emergence of skydiving and a decrease of danger? Not quite. It just says “in recent years”, there have been fewer injuries. Is this argument vulnerable to the objection of, “Sure, but there would be even fewer skydiving injuries if there were no skydiving”? No. That’s sort of a cheap, vacuous objection. e.g., “There would be fewer bear attacks if there were no bears.” In the original argument and in the correct answer, we can argue that other things are changing that are making the background situation better, whereas the thing from the conclusion is still keeping the situation from being better than it is. ORIGINAL: Public health indicators have gotten better because of advances in medicines, screening, and therapies. But they would be even higher than they are without us suffering the adverse effects of car exhaust. CORRECT: There are fewer traffic accidents nowadays because of better traffic signs, lower speed limits, better safety features on cars. But there would be even fewer accidents if people weren’t using their cell phones while driving. There’s no analogous way to do that with (D).

  5. Bad Conclusion Match0% picked this

    people with insurance do not need to lock their doors because if anything is stolen the insurance company

    The conclusion here isn’t anti-causal. It’s saying that “inspecting isn’t necessary”. That’s enough of a mismatch to bail.

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