What does the Question Stem tell us?
This is an Identify the Conclusion question which asks for the political scientist's main conclusion.
Break down the Stimulus:
The political scientist first describes how politicians criticize their opponents for presenting ideas in a way that cannot be understood. The "however" in the second sentence indicates that the political scientist disagrees with this criticism—specifically, he claims that it is never sincere. So far, the argument seems to follow a common pattern: an opposing point, then a "however" leading to the main conclusion. We would expect the remainder of the argument to provide support for that main conclusion.
The test writers try to complicate the argument by presenting an additional premise and conclusion in the last sentence: because political mobilization requires commonality of purpose, we can conclude that political agendas will not be realized (won't succeed) if a large number of people cannot understand them.
Any prephrase?
The second sentence still looks like the political scientist's main conclusion: the politicians' criticism of their opponents is never sincere.
If you're tempted to view "political agendas will not be realized if a large number of people cannot understand them" as the main conclusion, consider how it relates to the claim that the politicians' criticism of their opponents is never sincere. We already know that the opponents' political agendas won't be understood, and now we're told that if they won't be understood then they won't succeed. Taken together, that seems to support the claim that the politician's criticism isn't sincere. Why would politicians criticize something that prevents their opponents from succeeding?
Correct answer:
The correct answer is (D).
Answer choice analysis:
A) This answer choice indicates that the politicians' opponents should be considered insincere. The main conclusion is that the politicians' criticism is insincere.
B) The political scientist doesn't claim that politicians are insincere whenever they criticize the manner in which an agenda is presented. The conclusion is only about criticism that focuses on one specific manner of presenting an agenda: presenting it in an incomprehensible way.
C) The conclusion is that a certain type of criticism is never sincere, but the political scientist doesn't actually say that this is a reason to refrain from that criticism. Refraining from criticism, or engaging in it, is an entirely new concept that isn't part of the main conclusion.
D) This is the political scientist's conclusion.
E) This connects two ideas in the last sentence of the stimulus, but it's not something explicitly stated in the stimulus and is not the main conclusion.
Takeaway/Pattern: Identify the Conclusion questions often try to confuse us by presenting multiple claims, such as an opposing claim or an intermediate conclusion. Our goal is to identify the main conclusion of the argument.
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