大全第40题，关于as as 用法

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

请问大家，为何C不对？  

E选项中，as as 后面为什么不加those?

多谢指点，那么E选项的问题呢？