求一道GMAT语法题目

题目

求一道GMAT语法题目
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
A为什么可以倒装。

答案

B
teenagers undergo stress, but results indicate that the patterns are more than what boys experience