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1.        According to a study by the Carnegie Foundation for the Advancement of Teaching, companies in the United States are providing job training and general education for nearly eight million people, about equivalent to the enrollment of the nation’s four-year colleges and universities.

(A) equivalent to the enrollment of

(B) the equivalent of those enrolled in

(C) equal to those who are enrolled in

(D) as many as the enrollment of（E）

(E) as many as are enrolled in

What'r wrong with (d)? and why in (e) there isnt any noun or pronoun in front of "are enrolled in"? thanks for helping me.

eight million people和the enrollment 不可比较

e：  are enrolled 前省略与前面相同的主语 people，所以语法和逻辑上都对

顶！

比较句中到底那些成分是可以省略的呢？谢谢了。