Although they are more temperamental and far more expensive than transistor-driven amplifiers,
many audiophiles and audio professionals prefer the warmer, richer tones produced by vacuum-tube-driven amplifiers.Clearly the comparison should be made between amplifiers.
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(A) many audiophiles and audio professionals prefer the warmer, richer tones produced by vacuum-tube-driven amplifiers
comparison is wrong. amplifiers are compared to audiophiles and audio professionals.
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(B) many audiophiles and audio professionals think the warmer, richer tones produced by vacuum-tube-driven amplifiers make them preferable
same reason as in A
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(C) warmer, richer tones are produced by vacuum-tube-driven amplifiers and they are thus preferred by many audiophiles and audio professionals
comparison is wrong. amplifiers are compared to tones.
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(D) vacuum-tube-driven amplifiers are preferred because they produce warmer, richer tones by many audiophiles and audio professionals
comparison is correct, but rich tones are not produced by audiophiles and audio professionals, they are produced by the amplifiers. SO D is out.
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(E) vacuum-tube-driven amplifiers are preferred by many audiophiles and audio professionals because these amplifiers produce warmer, richer tones
Clean comparison. Correct meaning.