The "Law" of Diminishing Returns

Multiple Choice

The "law" of diminishing returns

A) is deduced from the basic biochemical relationship of agricultural theory.
B) was constructed as the basis of observation during experiments on the impact of fertilizer on output in the 1930s.
C) is based on regular observations of input-output relationships over the last two centuries.
D) is borrowed from physical laws related to conversion of matter and energy.