The Asian American History Association receives approximately 1,000 proposals each year from individuals who wish to present papers at its annual meeting. The association’s officers would like to ensure constant standards of quality in the presentations from year to year. The officers have therefore decided to accept for presentation each year only the best 300 papers selected on the basis of the quality of the proposals submitted.
Of the following, the best criticism of the officers’ plan is that the plan assumes that
(A) Professional associations cannot accept all papers submitted for presentation at their annual meetings.
(B) The total number of proposals submitted to the association will remain at approximately 1,000 in future years.
(C) Each proposal submitted to the association deserves to be considered a serious candidate for presentation.
(D) It is difficult to judge the quality of a paper on the basis of the proposal alone.
(E) The best 300 papers submitted to the association for presentation will be of the same quality from year to year.
答案是E，D为什么不对？请教，谢谢。

试解答如下：
     D取非无法weaken原文的推理

看来要抓住关键词"constant"是至关重要了。

D更本不是plan的假设，所以不对，D反对原文

我想问B为什么不对……请赐教！