OG 118题 (黄色) -- 指代问题

118. Students in the metropolitan school district lack math  skills to such a large degree as to make it difficult  to absorb them into a city economy becoming ever more dependent on information-based industries.

(A)         lack math skills to such a large degree as to make it difficult to absorb them into a city economy becoming

(B)         lack math skills to a large enough degree that they will be difficult to absorb into a city's economy that becomes

(C)        lack of math skills is so large as to be difficult to absorb them into a city's economy that becomes

(D)        are lacking so much in math skills as to be difficult to absorb into a city's economy becoming

(E)         are so lacking in math skills that it will be difficult to absorb them into a city economy becoming

这题答案选择E,我选成D了,其实我觉得D和E都有问题. 在E中,代词them有指代混淆的可能,有可能指代Students也有可能指代skills,这也是我为什么没有选择E的原因,还请牛人指点啊,谢谢啦

我觉得,从句中的代词优先指代主句主语。