What was as remarkable as the development of the Compact Disc has been the use of the new technology to revitalize, in better sound than was ever before possible, some of the classic recorded performances of the pre-LP era.
A) What was as remarkable as the development of the Compact Disc
B) The thing that was as remarkable as the developing the Compact Disc
C) No less remarkable than the development of the Compact Disc
D) Developing the Compact Disc has been none the less remarkable as the development than
E) Development of the Compact Disc has been no less remarkable as
I'll go with C
B is wrong because "The thing" is wordy and "developing" is not in sync with " the use" in the later part of the sentence.
D is wrong because it is too wordy and unidiomatic
E is wrong because "no less remarkable" requires "than" not "as"
We're left with A and C. I'll choose C because of 2 reasons
1) In A, becuase of the presence of "has been" in the later part of the sentence, the first part of the sentence should be in present tense
2) C is a lot more concise than A is