Because of dramatic improvements in computing technology, $200 today buysdouble the hard drive space that it has in 2004.
(A) double the hard drive space that it has- Usage of "has" is incorrect tense here
(B) double the hard drive space that it did -CORRECT
(C) as much as twice the hard drive space it has- Usage of "as much as" is incorrectly used for comparison here
(D) two times as many hard drive space as there were - Usage of "there were" is incorrect here
...
(A) double the hard drive space that it has- Usage of "has" is incorrect tense here
(B) double the hard drive space that it did -CORRECT
(C) as much as twice the hard drive space it has- Usage of "as much as" is incorrectly used for comparison here
(D) two times as many hard drive space as there were - Usage of "there were" is incorrect here
...

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