Logical ReasoningDifficulty: Easy

PT128 S2 Q4 Explanation

In the spring and fall, eastern

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

TopicsParadox

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Stimulus

In the spring and fall, eastern pipistrelle bats roost deep inside caves. They feed at night on flying insects and must leave the cave to catch their prey. Flying insects are much more abundant on warm nights than on cool ones. Researchers found that many more bats leave the caves on warm bats roost remains virtually the same from one night to the next.

What this question is testing

Paradox

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
4.

Which one of the following, if true, most helps to explain the

Answer choices

  1. Trap2% picked this

    The researchers studied only female bats, which tended to catch more insects on warm nights than

  2. Correct90% picked this

    Eastern pipistrelle bats can detect changes in barometric pressure within the caves that correlate closely with changes in

    Why this is right

    Answer B is correct.

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

  3. Trap4% picked this

    Eastern pipistrelle bats are incapable of long periods of sustained activity outside the roosting caves on very cool

  4. Trap2% picked this

    Because of the long period of winter inactivity, eastern pipistrelle bats tend to consume more insects per day in the spring and

  5. Trap3% picked this

    During the periods in which the researchers studied the bats, on most evenings over half of the bats left the

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