Answer:
B. in both industry structures, the firm's demand curve is downward sloping.
Explanation:
Both firm types have a downward sloping demand curve which indicates that as price is increased, quantity demanded falls.
Monopolistic competition have no barriers to entry while a monopoly does.
Monopolistic competition have many sellers while a monopoly has one seller.
Monopolistic competition break even in the long run while monopoly maintain super normal profits in the long run