If the Social Costs of Driving an Automobile Are Greater

If the social costs of driving an automobile are greater than the private costs of driving an automobile, then

A) the external costs of auto driving exceed the social costs of auto driving.
B) the external costs of auto driving exceed the internal costs.
C) the price of automobile driving is too high.
D) either people drive their autos too much or more funds should be spent on reducing air pollution.