In an analysis of the environmental impact of a community's motor vehicle use, which of the following is best represented by "a" in the I = P x A x T equation?

a) energy efficiency of motor vehicles.

b) the number of cars owned by each household.

c) average family size.

d) the average daily commute by motor vehicles.

The answer is B.

Step-by-step explanation:

The variable A in the I=PAT equation stands for affluence. It represents the average consumption of each person in the population. As the consumption of each person increases, the total environmental impact increases as well. The choice B is the best choice that represents average consumption of each person in the population.