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92. Between 1960 and 1970, world oil consumption approximately doubled. Which of the following explanations is consistent with this increase?
(A) The number of passengers per car increased
(B) People drove less, conserving gasoline
(C) The price of gasoline increased
(D) The number of cars on the road increased
(E) Cars that were more fuel-efficient were manufactured
What is the number of cars that were on the road increased?