Which of the Following Is Not Necessarily True at the Profit-Maximizing

Multiple Choice

Which of the following is not necessarily true at the profit-maximizing quantity for a monopolist?

A) The marginal revenue is equal to the marginal cost of production.
B) The slope of the marginal revenue curve equals the slope of the marginal cost curve.
C) The difference between total revenue and total cost is maximized.
D) The difference between price and average cost is maximized.