132. 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.as many as are enrolled in

我选D，因为enrollment 本身有“注册人数”的意思，为什么不能和eight million people比较呢？请高手指点一下，谢谢：)

在划线的前面有个about,这个词是介词,有跟as many as好像不太好.