[求助]问一题关于than的用法，请nn指点

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 at speeds much higher than are

我觉得选d，可是不对，到底选哪个？than怎么用呢？请nn指点

OG上没找到这题。

应该选E.are前省略了speeds that