单选题 Politician: Nobody can deny that homelessness is a problem yet there seems to be little agreement on how to solve it. One thing, however, is clear: ignoring the problem will not make it go away. Only if the government steps in and provides the homeless with housing will this problem disappear, and this necessitates increased taxation. For this reason, we should raise taxes.
Which one of the following principles, if valid, most supports the politician's argument?

A、 Only if a measure is required to solve a problem should it be adopted.
B、 Only if a measure is sufficient to solve a problem should it be adopted.
C、 If a measure is required to solve a problem, then it should be adopted.
D、 If a measure is sufficient to solve a problem, then it should be adopted.
E、 (E) If a measure is sufficient to solve a problem, any steps necessitated by that measure should be adopted.

【正确答案】 C

【答案解析】[解析] 政治家根据解决无家可归问题需要增加税收做出了应该增加税收的结论。显然(C)所陈述的推理模式与政治家的相一致，因此(C)选项最能支持政治家的论述；增加税收只是解决无家可归的一个必要条件，因此(A)、(B)、(D)和(E)都不能支持政治家的论述。