Over the past 40 years in the United States, the number of vehicles on the road has A) decreased but the number of vehicle miles has increased, and the pollution per car has increased. B) decreased, the number of vehicle miles has decreased, and the pollution per car has decreased. C) increased, the number of vehicle miles has increased, but the pollution per car has decreased D) increased, the number of vehicle miles has increased, and the pollution per car has increased.
Over the past 40 years in the United States, the number of vehicles on the road has
A) decreased but the number of vehicle miles has increased, and the pollution per car has increased.
B) decreased, the number of vehicle miles has decreased, and the pollution per car has decreased.
C) increased, the number of vehicle miles has increased, but the pollution per car has decreased
D) increased, the number of vehicle miles has increased, and the pollution per car has increased.
Over the past 40 years in the United States, the number of vehicles on the road has increased, the number of vehicle miles has increased, but the pollution per car has decreased.
The polices and the measure taken in U.S has improved the air quality in last 40 years.
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