Logical ReasoningDifficulty: Hard

PT104 S4 Q20 Explanation

Art Historian: Robbins cannot pass

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

TopicsNecessary Assumption

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Stimulus

Art Historian: Robbins cannot pass judgment on Stuart’s art. While Robbins understands the art of Stuart too well to dismiss it, she does enough to praise it.

What this question is testing

Necessary Assumption

Your task

Find the assumption the argument requires in order for its conclusion to hold.

Common trap

Answers that would help the argument but aren't strictly required (sufficient, not necessary).

Winning move

Negate each choice — the right one breaks the argument when negated.

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

The question
20.

The art historian’s argument depends on the

Answer choices

  1. Correct65% picked this

    In order to pass judgment on Stuart’s art, Robbins must be able either to dismiss it

    Why this is right

    This answer surprises me because it actually uses the Concession (R understands the art of S too well to dismiss it), but it matches the Evidence to Conclusion move. As written, this rule is saying Passing judgment ---requires--> Dismiss or Praise The contrapositive form would better match the argument, since the Conclusion of the argument should match the Right side of the conditional, and the conclusion was "can't pass judgment". Unable to Dismiss and → Can't Pass Judgment Unable to Praise The evidence established that Robbins can't dismiss S's art (because she understands it too well) and established that Robbins can't praise S's art (because she doesn't understand it well enough). And the conclusion is saying that Robbins can't pass judgment on S's art. If Necessary Assumption offers us a conditional answer, and we see that it matches a move the author made, we can pick it.

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

  2. Relative vs. Absolute7% picked this

    If art can be understood well, it should be either dismissed

    Relative vs. Absolute: well (enough) Unrelated to Goal: pass judgment The argument only discussed understanding something "well enough", not "well". We want to always be wary of shifts between Relative language and Absolute language. I can be tall enough to ride a rollercoaster, but not tall. Also, the conclusion is about whether or not Robbins can pass judgment on S's art, but we've never defined a rule for when someone can / can't pass judgment on S's art. On Assumption questions, if there's New Language in the Conclusion, then almost 100% of the time the correct answer will have that New Language in it. So since this answer doesn't have "can / can't pass judgment", it's instantly unattractive.

  3. Bad Conclusion Match10% picked this

    In order to understand Stuart’s art, Robbins must be able to pass

    When we say in order to X, you must Y we're saying X requires Y which looks like X → Y Understanding S's art requires being able to pass judgment. Understanding → Pass Judgment The move the author made in this argument from Premise to Conclusion wasn't "If you can understand it, you can pass judgment on it". The move she made was, "If you can't praise it (or dismiss it), then you can't pass judgment on it". We want our Conclusion to be on the Right side of any conditional relationship we're dealing with. Our conclusion is "cannot pass judgment". The right side of this conditional is, "able to pass judgment". The version of this answer we want to hear is In order to pass judgments on Stuart's art, you need to understand it well enough to praise it.

  4. Trap4% picked this

    Stuart’s art can be neither praised

    Too Strong Unrelated to Goal: pass judgment The author wasn't saying that it's impossible to praise or dismiss Stuart's art. She was only saying that Robbins couldn't do so. Also, this doesn't have the conclusion's New Idea, "pass judgment".

  5. Trap13% picked this

    If Robbins understands art well, she will

    Too Strong Unrelated to Goal: pass judgment The author was never guaranteeing that in all cases of Robbins understanding art well, she ends up praising it. Also, this doesn't have the conclusion's New Idea, "pass judgment".

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