Logical ReasoningDifficulty: Hard

PT151 S4 Q13 ExplanationLegislator: My colleague says

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

TopicsFlaw

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Stimulus

Legislator: My colleague says we should reject this act because it would deter investment. But because in the past she voted for legislation that inhibited investment, this surely is not the real reason she opposes the act. Since she has not revealed her So we should vote to approve the act.

What this question is testing

Flaw

Your task

Describe the reasoning error the argument actually commits.

Common trap

Answers that name a real logical flaw the argument doesn't actually make.

Winning move

Articulate the gap in the reasoning yourself, then match it to the choice that describes that 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
13.

The reasoning in the legislator's argument is most vulnerable to the criticism

Answer choices, explained

  1. Out of Scope: personal character trait16% picked this

    treats a personal character trait as if it were evidence of the professional viewpoint of the

    The argument doesn't bring up any personal character traits. This answer is trying to fish in people who had a sense that this argument involved an Ad Hominem flaw (one version of ad hominem, although incredibly rare, is rejecting an argument on the basis of the source's personal qualities, rather than the merits of their ideas).

  2. Correct65% picked this

    fails to address the grounds on which the colleague claims the act

    Why this is right

    When we complain about an Ad Hominem move, we're saying, "No fair — you can't dismiss someone's ideas just because they have a biased interest in being right or because they have conflicting past behavior. You need to assess the merits of that person's ideas!" That's what this answer is complaining about. Our author addressed a tangential issue about the colleague, rather than substantively addressing the colleague's concern about whether this act would deter investment.

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

  3. Out of Scope: minority position2% picked this

    presumes, without providing justification, that the colleague's opposition to the act is the minority position

    The author isn't assuming anything about whether the colleague is in the minority or majority position in the legislature. The argument wouldn't be affected one way or the other if she were one vs. the other.

  4. Out of Scope: voters1% picked this

    presumes, without providing justification, that voters will oppose legislation that

    This argument has nothing to do with voters, so the author isn't making any assumptions about what voters will / won't oppose.

  5. Does Consider / Not an Objection15% picked this

    fails to consider that the colleague's opposition to the act may be a response

    The author is definitely considering alternative explanations for why the colleague is opposing the act. In saying, "this surely is not the real reason she opposes the act", the author is saying, "there must be some other reason". This would strengthen that mindset: she's not opposing because it'll inhibit investment, she's doing so because of her constituents.

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