求教大全上一题,未见讨论13-3

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

想知道a项何处不妥?