Logical ReasoningDifficulty: Hard

PT16 S3 Q15 Explanation

The only plants in the garden

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

TopicsParallel Flaw

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Full official LSAT questions are available through LawHub. This page provides LSAT Lab's explanation, strategy, and review tools without republishing the full official question.

Stimulus

The only plants in the garden were tulips, but they were tall tulips. So the only plants were tall plants.

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
15.

Which one of the following exhibits faulty reasoning most similar to the faulty reasoning in

Answer choices

  1. Trap20% picked this

    The only dogs in the show were poodles, and they were all black poodles. So all the dogs

  2. Trap2% picked this

    All the buildings on the block were tall. The only buildings on the block were office buildings and residential towers. So all the office

  3. Correct66% picked this

    All the primates in the zoo were gorillas. The only gorillas in the zoo were small gorillas. Thus the only primates in

    Why this is right

    Answer C is correct.

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

  4. Trap10% picked this

    The only fruit in the kitchen was pears, but the pears were not ripe. Thus none of the fruit

  5. Trap2% picked this

    All the grand pianos here are large. All the grand pianos here are heavy. Thus

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