Which of the Following Statements Is False

Which of the following statements is false?

A) If a perfectly competitive firm produces the quantity of output at which MR = MC, it follows that the firm may or may not be earning a profit.
B) The firm's supply curve is that portion of its AVC curve that lies above its MC curve.
C) If price is above ATC at the quantity of output at which MR = MC, the firm will be earning a profit.
D) In long-run competitive equilibrium, price is equal to marginal cost.