William Nordhaus' Depletion Hypothesis

William Nordhaus' depletion hypothesis

A) is an attempt to explain the drop in the multifactor productivity growth rate between 1913 and 1964.
B) suggests that depletion of natural resources may explain part of the drop in multifactor productivity growth.
C) suggests that a drop in the rate at which new inventions are made may explain part of the drop in multifactor productivity.
D) B and C
E) all of the above