Although one link in the chain was demonstrated to be weak, but not sufficiently so to require the recall of the automobile.

(A) demonstrated to be weak, but not sufficiently so to require

(B) demonstrated as weak, but it was not sufficiently so that it required

(C) demonstrably weak, but not sufficiently so to require

(D) demonstrably weak, it was not so weak as to require（D）

(E) demonstrably weak, it was not weak enough that it required

为什么Ａ错了啊？大家来帮帮我吧，谢谢了