Which of the Following Is True in Both Perfect Competition

Multiple Choice

Which of the following is true in both perfect competition and monopoly?

A) Firms produce a differentiated product.
B) Firms cannot earn economic profit in the long run.
C) Individual firms have no ability to control the price of their output but must accept the market price.
D) Firms go out of business in the long run if total revenue cannot cover total cost.
E) Firms can earn economic profit in the long run.