Which of the Following Statements Is NOT Characteristic of a Perfectly

Which of the following statements is NOT characteristic of a perfectly competitive industry in long-run equilibrium?

A) Ceteris paribus, there is no tendency for firms to either enter or exit the industry.
B) A profit-maximizing firm may produce any output level at which P < LRATC.
C) No firm earns an economic profit.
D) Every firm produces at an output level at which MC = LRATC.