If Equal Increments of One Variable Input Are Added While

Multiple Choice

If equal increments of one variable input are added while keeping the amounts of all other inputs fixed, and increasing additions to total product occur, then:

A) diminishing marginal returns have begun.
B) the output level where marginal product is maximized has not yet been reached.
C) average product has reached its maximum.
D) average product is at its minimum.
E) average product is declining.