一个语法真题的答案讨论

A和D比

是不是应该用other把自己先摘出来呢？

The success of the program to eradicate smallpox has stimulated experts to pursue what they had not previously considered possible--better control, if not eradication, of the other infections such as measles and yaws.

(A) what they had not previously considered possible--better control, if not eradication, of the other infections such as
(B) what they had not previously considered a possibility--better control, if not eradication, of such infections like
(C) something they had not previously considered possible-better control, if not eradication, of such infections as
(D) something not considered a previous possibility--better control and perhaps eradication, of other infections such as
(E) the possibility of what they had not previously considered--better control and possibly eradication of infections like

请问为什么第一步就可以看出只能选A or B呢？ something 为什么不可以呢? C 选项错在哪里呢？

Many thanks!

举例用such as, 非比较like,  B E 错.

排除自己必须有the
other, C 错

随意添加perhaps且并列, D 错

C is the correct answer.

A is wrong for the following reasons:

A) what they had not previously considered possible--better control, if not eradication, of the other infections such as

I don't think C is good,"something" should be linked with a "that" clause.

anyone who can shed light on why D is the answer?

thx

prep2原题，选c