GMAT Critical Reasoning (CR) | Ten years ago, the total share of federal, state, and local taxes

Ten years ago, the total share of federal, state, and local taxes was 23 percent of the nation’s Gross National Product. Now, that share has decreased to 21 percent.

Which one of the following can be properly inferred from the facts given above?

(A) The total amount of federal, state, and local taxes paid now is less than the amount paid ten years ago.
(B) On average, people now have a better standard of living than they did ten years ago.
(C) The average taxpayer keeps a greater percentage
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