Logical ReasoningDifficulty: Medium

PT2 S4 Q19 Explanation

Some cleaning fluids

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

TopicsMain Conclusion

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Stimulus

Some cleaning fluids, synthetic carpets, wall paneling, and other products release toxins, such as formaldehyde and benzene, into the household air supply. This is not a problem in well-ventilated houses, but it is a problem in houses that are so well insulated that they trap toxins as well as heat. Recent tests, one test, 20 large plants eliminated formaldehyde from a small, well-insulated house.

What this question is testing

Main Conclusion

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
19.

The passage is structured to lead to which one of the

Answer choices

  1. Inference-Bait6% picked this

    Houseplants can remove benzene from the

    We know benzene is a toxin and that houseplants can remove some toxins, so this answer is trying to bait us into assuming that houseplants can remove benzene. But even if we knew this, it would be a Premise, a reason for ultimately concluding "it would be a good idea to have houseplants!"

  2. Inference Bait0% picked this

    Nonsynthetic products do not release toxins

    This sounds nothing like our goal (get some houseplants if your house is poorly ventilated / well insulated). It sounds more like a trap answer on an Inference question. We were told that synthetic products release toxins, so this is doing the classic "Illegal Opposite" kind of answer that "non-synthetics don't release toxins". This is essentially an Illegal Negation of a background fact.

  3. Word Salad / Unrelated to Goal2% picked this

    Keeping houseplants is an effective means of trapping heat in a

    The passage is making us think that houseplants would absorb toxins that get trapped in the house. It says nothing about houseplants trapping heat. The insulation traps the heat (and the toxins).

  4. Correct74% picked this

    Keeping houseplants can compensate for some of the negative effects of

    Why this is right

    It suggests that houseplants can alleviate the problem of trapped toxins in houses with poor ventilation, aligning with the evidence about houseplants removing toxins.

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

  5. Unsupported Comparison17% picked this

    The air in a well-insulated house with houseplants will contain fewer toxins than the air in a

    This statement makes a comparison that the argument does not cover. The argument only mentions houseplants removing some toxins; it does not compare toxin levels in different house types.

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