"Doomsday" Predictions About the Imminent Depletion of One or More

Multiple Choice

"Doomsday" predictions about the imminent depletion of one or more of our vital natural resources usually are

A) correct but are not reflected by relative price changes within our market economy.
B) overstated because of arithmetic calculation mistakes.
C) overstated because they disregard human responses to relative price changes.
D) understated because substitutes for such natural resources are also becoming less available.