Logical ReasoningDifficulty: Easy

PT107 S1 Q24 Explanation

Automobile-emission standards are

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

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Stimulus

Automobile-emission standards are enforced through annual inspection. At those inspections cars are tested while idling; that is, standing still with their engines running. Testing devices measure the levels gases leave the tail pipe.

What this question is testing

Weaken

Your task

Find the choice that makes the argument's conclusion less likely to be true.

Common trap

Answers that look negative but attack a claim the argument never relied on.

Winning move

Find the assumption the argument depends on, then pick the choice that undermines it.

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

The question
24.

Which one of the following, if true, most strongly indicates that current enforcement of automobile-emission standards might be ineffective in

Answer choices

  1. Trap2% picked this

    As an emission-control technology approaches its limits, any additional gains in effectiveness become

  2. Trap7% picked this

    The testing devices used must be recalibrated frequently to measure pollutant levels

  3. Correct86% picked this

    The adjustments needed to make a car idle cleanly make it likely that the car will emit high levels of pollutants

    Why this is right

    Answer C is correct.

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

  4. Trap3% picked this

    Most car owners ask their mechanics to make sure that their cars are in compliance

  5. Trap2% picked this

    When emission standards are set, no allowances are made for

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