Sentence Correction

Because of dramatic improvements in computing technology, $200 today buys double the hard drive space that it has in 2004.

A) double the hard drive space that it has
B) double the hard drive space that it did
C) as much as twice the hard drive space it has
D) two times as many hard drive space as there were
Ee) a doubling of the hard drive space that it did

B is the correct answer,

A)that it has is wrong here
C)Same as A
D)as many hard drive space is wrong
E) buys a doubling of hard drive space . doubling cannot be bought, it is the space