Logical ReasoningDifficulty: Medium

PT121 S1 Q15 Explanation

There are two supposedly conflicting

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

TopicsNecessary Assumption

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Stimulus

There are two supposedly conflicting hypotheses as to what makes for great national leaders: one is that such leaders successfully shape public opinion, and the other is that they are adept at reacting to it. However, treating these hypotheses as mutually exclusive is evidently a mistake. All leaders who have had success been adroit both in shaping and reacting to public opinion.

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
15.

Which one of the following is an assumption on which the

Answer choices

  1. Correct76% picked this

    Having success getting programs passed by the legislature is indicative of being a

    Why this is right

    This provides the crucial link we were looking for between the evidence and the conclusion. The conclusion was about "great national leaders" while the evidence was about "leaders who are successful getting programs passed by the legislature". The author was assuming those ideas are connected. If we negated this answer and said, "having success getting programs passed by the legislature has nothing to do with being a great national leader", that would badly weaken the argument, because it would mean that the evidence was totally irrelevant to the conclusion.

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

  2. Too Strong: impossible11% picked this

    It is impossible to successfully shape public opinion without in some way

    The author is only arguing that great national leaders are able to shape and react to public opinion. She isn't saying that shaping public opinion always in 100% of cases involves reacting to it. This answer says that "every single time you shape public opinion, you react to it".

  3. Too Strong10% picked this

    To lead, one must either successfully shape public opinion or be adept at reacting to

    Too Strong: must / any form of leading The author is never defining necessary characteristics to lead. She is talking about signature characteristics of great national leaders. If we changed this answer to say, "to be a great national leader, you must shape opinion, react to it, or both", then it would be much closer to correct.

  4. Out of Scope: "good rapport"2% picked this

    Having a good rapport with the members of the legislature allows a leader to

    The argument doesn't get into how some leaders successfully get programs passed by the legislature. It might be through having a good rapport. It might be through having leverage over legislative members, such as blackmailing them or pressuring them. We don't know. The author isn't making any specific assumptions about how certain leaders get their programs passed.

  5. Opposite (if anything)1% picked this

    To be a great leader one must not be swayed by

    Our author thinks that great national leaders both shape public opinion and react to it. "Reacting to" public opinion doesn't necessarily mean being swayed by public opinion, but there's a lot of overlap there. So our author would probably believe the opposite of this answer.

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