LSAT-5-2-25

25.The public in the United States has in the past been conditioned to support a substantial defense budget by the threat of confrontation with the Eastern bloc.  Now that that threat is dissolving, along with the Eastern bloc itself, it is doubtful whether the public can be persuaded to support an adequate defense budget.
Which one of the following indicates a weakness in the position expressed above?
(A) It presupposes that public opinion can be manipulated indefinitely, without the public's becoming aware of that maniprlation
(B) It refers to past and present events that do not have a causal connection with public support of the budget.
(C) It assumes as fact what it seeks to establish by reasoning
(D) It fails to give any reason for the judgment it reaches.
(E) It hinges on the term"adequate" the precise meaning of which requires reevaluation in the now context.

没有读懂，请大家指点how E to weaken the position

首先这不是一个削弱题，而是一个改错题！虽然有时两者界限不清，但原则上，改错题完全基于原文找出逻辑错误，诸如偷换概念，循环论证，用词混淆等。而削弱题则是对原文错误的地方加以例证，举出一个事实。

本体是用词混淆的错误，（E）的含义是：原文推理的合理性取决于目前情况下对“适当”一词是如何定义的。