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Method of Reasoning—Argument Part. The correct answer choice is (B)
The conclusion in this case is presented in the first sentence of the stimulus: It is unlikely that the world
will ever be free of disease. This conclusion is based on the premise that most diseases are caused by
microorganisms that quickly adapt to new medicines, while maintaining the ability to infect and kill
The question asks us to identify the role of the first sentence, which is the conclusion of the argument.
Answer choice (A): Even though the first sentence is the conclusion, it is not supported by any premises
about numerous microorganisms. “Prolific” means “productive,” and in this context it simply refers to
the ability of the microorganisms to adapt, survive, and continue infecting and killing humans. This
choice is wrong.
Answer choice (B): This is the correct answer choice, because the first sentence is the conclusion, and
it is supported by the premise that disease-causing microorganisms adapt well to medicines.
Answer choice (C): The claim in question is not a premise, so this choice is incorrect.
Answer choice (D): The first sentence in the stimulus is not a “generalization used to predict,” so this
choice is incorrect.
Answer choice (E): The claim in question is the conclusion, but the argument is only that disease-causing
microorganisms adapt well to medicines, not that they are immune.