According to analysts, an alliance between three major personal computer companies and most of the nation’s largest local telephone companies would enable customers to receive Internet data over regular telephone lines with speeds much higher than is currently possible.

A. with speeds much higher than is

B. with speeds that are much higher than are

C. at much higher speeds as are

D. at much higher speeds than that (E)

E. at speeds much higher than are

请问，D为什么错？

E是从下面的句子省略来的吗？：

at speeds (that are) much higher than are currently possible (speeds)

请NN和版主出手相助，谢谢！