If, After Reaching a Certain Level of Production, One Additional

Multiple Choice

If, after reaching a certain level of production, one additional unit an input variable would produce a decline in total product, then:

A) diminishing marginal returns to that input have begun.
B) the output level where marginal product of that input is maximized has not yet been reached.
C) the output level where marginal product of that input is equal to zero has been reached.
D) average product of that input is at its minimum.
E) average product of that input is increasing.