24. Rumored declines in automobile-industry revenues are exaggerated. It is true that automobile manufactures' share of the industry's revenues fell from 65 percent two years ago to 50 percent today, but over the same period suppliers of automobile parts had their share increase from 15 percent to 20 percent and service companies (for example, distributors, dealers, and repairs) had their share increase from 20 percent to 30 percent.
Which one of the following best indicates why the statistics given above provide by themselves no evidence for the conclusion they are intended to support?
(A) The possibility is left open that the statistics for manufactures' share of revenues come from a different source than the other statistics.
(B) No matter what changes the automobile industry's overall revenues undergo, the total of all shares of these revenues must be 100 percent.
(C) No explanation is given for why the revenue shares of different sectors of the industry changed
(D) Manufactures and parts companies depend for their revenue on dealers' success in selling cars.
(E) Revenues are an important factor but are not the only factor in determining profits.
请问B是如何证明结论是错误的？原文只提到了各年收益所占industry revenues的比率，都是变量，没提到过基数到底是多少，B所说的无论他们总revenues如何变，the total of all shares of these revenues must be 100 percent，如何理解到底？
automobile-industry revenues=
automobile manufacturers' revenues+
revenues of suppliers of automobile parts+
service companies' revenues
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