Questions 12-13 are based on the following.
Record companies defend their substitution of laser-read compact discs (CD’s) for the much less expensive traditional long-playing vinyl records in their catalogs by claiming that the audio market is ruled by consumer demand for ever-improved sound reproduction rather than by record manufacturers’ profit-motivated marketing decisions. But this claim cannot be true, because if it were true, then digital audiotape, which produces even better sound than CD’s, would be commercially available from these same record companies, but it is not.
12. Which of the following, if true, best explains how the record companies’ claim about the nature of the audio reproduction market could be true and digital audiotape nevertheless be unavailable for the commercial market?
(A) Most consumers prefer audiotape to long-playing records or CD’s because of the tape’s durability and compactness.
(B) Prototypes of digital audiotape have been used to make master tapes of some performances in recording studios.
(C) The manufacturing technology that underlies the commercial production of CD’s requires equipment very similar to that needed for commercial production of digital audiotape.
(D) Record companies have not yet solved several quality-control problems that have beset attempts to produce digital audiotape in commercial quantities.（D）
(E) CD’s are more expensive than long-playing vinyl records by about the same ratio as digital audiotape cassettes would be more expensive than conventional cassettes.
答案是D，但我没看懂题意，请nn能给小的解释一下吗？深谢！
偶简化一下题目：
文中说到三样东东：A，B，C。（依次按其音质从高到低）
文章主要说一个公司的导向问题，一种是顾客导向型，既公司跟着顾客的需求提供相应产品；另为一种是公司利益导向型，既公司提供可以赚取最多利益的产品。
文中用B产品取代C产品的公司对他们的行为解释是：顾客导向型而非利益导向型，因为顾客需要音质更好的产品。
本文作者反驳公司的说法，理由是：如果是因为顾客需要更好音质的产品，那么为什么不提供A产品，因为A的音质比B更好。
问题：解释公司的说法（即支持公司的说法）。
D指出不是公司不想提供A产品，而是由于技术问题，无法提供。
明白了。多谢LES
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