Powerscore CR---Automobile Industry

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 repairers) 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.

Total period is 2 years.

Before: manufactures' share = 65%, automobile parts = 15%, service companies = 20%
Over all Auto-mobile Industries Revenue = 65+15+20 = 100% But we don't know how much is the revenue but only the percentage.

After: manufactures' share = 50%, automobile parts = 20%, service companies = 30%
Over all Auto-mobile Industries Revenue = 50+20+30 = 100% But we don't know how much is the revenue but only the percentage.

To show that there is decrease in the total revenue of the automobile industry, the data should be in accordance to the over all industry's revenue. But the premises are showing the percentages of different market segments of the automobile industry. We cannot say anything about the over all industries.

Correct Answer is B

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