A new law gives ownership of patents--documents providing exclusive right to make and sell an invention--to universities, not the government, when those patens result from government-sponsered university research. Administratios at Logos University plan to sell any patents they acquire to corporations in order to fund programs to improve undergraduate teaching.

Which of the following, if true, would cast most doubt on the viability of the college administrations' plan described above?

(C)Research scientists at Logos University have few or no teaching responsibilities and participate little if at all in the undergraduate programs in their field.

(D)Government-sponsored research conducted at Logos University for the most part duplicates research already completed by several profit-making corporations.

(E)Logos University is unlikely to attract corporate sponsorship of its scientific research.

答案是D我很清楚，但是另外两个感觉也应该有削弱的作用，原文 卖掉所拥有的任何专利 -> 提高本科教学， C说教授无责任心，应该属于他因削弱（不是卖专利就可以提高教学质量的） E说根本这些专利不会吸引赞助公司，我觉得属于断桥削弱。

为什么不选这两个答案中的一个？请教