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generis
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Working with musician Stevie Wonder as a musical adviser, Ray Kurzweil developed what is now the preferred medium for creating nearly all music for today’s commercial albums, films, and television: a computer-based instrument capable of reproducing musical sounds of a quality once thought to be possible only on grand pianos and other acoustic instruments.

A) reproducing musical sounds of a quality once thought to be -> "reproducing musical sounds of a quality" is correct. Let's keep it.

B) reproducing musical sounds with a quality as were once thought to be -> as x as y is correct idiom form. We don't have another "as". Incorrect.

C) reproducing in musical sounds a quality that was once thought to be -> "reproducing in musical sounds a quality" is incorrect.

D) reproduction of musical sounds whose quality is the same as what were once thought to be -> We have multiple errors now. Whose is used for a person and As needs to be in correct form, as x as y. Incorrect.

E) reproduction of musical sounds at a quality once thought of as -> Same error as B. Incorrect.

So, I think A. :)
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The official explanation is here.
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Correct option A
A) reproducing musical sounds of a quality once thought to be - Correct

Eliminate B, "with sound" - "were - past tense"
B) reproducing musical sounds with a quality as were once thought to be

Eliminate C: reproducing in musical sound "that" - structure error
C) reproducing in musical sounds a quality that was once thought to be

Eliminate D, and E - Reproduction = Noun, we need "verb" here, and intended meaning error
D) reproduction of musical sounds whose quality is the same as what were once thought to be
E) reproduction of musical sounds at a quality once thought of as
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