For this question, I was able to see that the flaw was a equivocation between a substantial budget and an adequate one. Answer choice E seemed to reflect that train of thought, but I didn't find the wording to be clear. In particular, the answer choice mentions that the meaning of "adequate" needs to be reevaluated in the new context. Wasn't the word adequate brought up only in the conclusion? Where has the stimulus evaluated the use of adequate prior to the conclusion? Additionally, would the "new context" be the during the dissolving of the Soviet threat of confrontation?
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It's under the question bank, under flaw-descriptive weakening. Click on the Preptests 1-16 button and the difficulty button to arrange the questions from the most difficult to the least and it should be one of the top 10 questions or so that show up.
So first, you're correct in identifying the disconnect between the terms "substantial" and "adequate," as the problem; and the new context is referring to the newly emerging post cold war era.
So why would the definition of "adequate" which is relative, need to be reevaluated? I think maybe the idea is that the argument actually leaves the term undefined as it relates to "substantial." So if we think of this like a PSA question or something, we'd need something to the effect of, "despite the new context of world affairs, any defense budget that will be adequate will still remain quite substantial." So, that assumption in a sense, defines adequate within the new context. If the vulnerability is the absence of that assumption, then that's where that comes from.
Does this make any kind of sense? To be honest, I'm not entirely sure on this one. What do you think?
Also in spotting the equivocation, I saw this argument as having a causal premise that links the Soviet threat to the public being conditioned into supporting a substantial military budget. The conclusion attempts to show a situation where the cause doesn't exist (soviet threat dissovlving) and therefore the effect doesn't either, but conflates the terms "adequate" and "substantial" in doing so.
Hopefully more people could also weigh in on this question.