Sentence Correction

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

Anshu Nadir wrote: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 - incomplete
E. at speeds much higher than are

IMO: E

why option D is incomplete - "ät much higher speeds than that currently possible"

Anshu Nadir wrote:why option D is incomplete - "ät much higher speeds than that currently possible"

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 at much higher speeds than that missing "are" currently possible.

Please correct me, if am wrong and if there is some other way to eliminate D!

IMO E.

A/B - usage of with is wrong
C - usage of as is wrong
D - verb is missing in the second part.

Thank you Gk & Sam for explaining it further