请教大全sec13－3

As litigation grows more complex, the need that experts explain technical issues becomes more apparent.

(A) that experts explain technical issues becomes

(B) for experts to explain technical issues became

(C) for experts to explain technical issues becomes

(D) that technical issues be explained by experts became（C）

(E) that there be explanations of technical issues by experts has become

A为什么不好，能帮我解释一下A、C的区别吗？

need that不是惯用法。need for sb to do sth是惯用法。

thx！