[求助]帮帮帮个忙

Many teenagers undergo stress, but results of a recent study indicate that the patterns of stress that girls experience are more likely to result in depression than（ are those that boys experience）.

(A) are those that boys experience
(B) what boys experience
(C) boys' experience would
(D) boys' stress patterns do
(E) stress patterns of boys

答案是a，我凭感觉选了B，但是真不知道这道题要考察什么知识点，求助~~~

帖子沉了~~自己顶下，望有人解答~~·