"Diminishing Marginal Returns" Refer to a Situation in Which the A

"Diminishing marginal returns" refer to a situation in which the A) marginal cost of the next worker hired is less than the marginal cost of the previous worker hired. B) average cost of the next worker hired is less than the average cost of the previous worker hired. C) marginal product of the next worker hired is less than the marginal product of the previous worker hired. D) average product of the next worker hired is less than the average product of the previous worker hired.