If the Nation's Yearly Total Energy Use and Also the Yearly

If the nation's yearly total energy use and also the yearly gross national product [GNP] are graphed, the two graphs rise at the same rate until the mid- 1970s, but they diverge from each other after about 1973.This divergence of the graphs shows that

A) as the price of goods and services decreases, energy use increases.
B) an increasing GNP causes energy use to also increase.
C) U.S. energy efficiency decreased after 1973, due to lower energy prices.
D) energy use increases when the nation's goods and services increase.
E) energy efficiency has played a large role in providing goods and services since 1973.