Assume marginal costs are rising at all levels of output. If profits are maximized by a firm, whether monopolistic or perfectly competitive,

A. output should be increased whenever marginal cost is below average total cost.

B. output should be increased whenever marginal revenue is less than marginal cost.

C. output should be increased whenever marginal revenue exceeds marginal cost.

D. the firm should produce at a level where marginal cost is equal to average total cost.

E. We have insufficient information to answer this question.