If Perfectly Firms Are Making an Economic Profit,then

If perfectly firms are making an economic profit,then

A) the market is in its long-run equilibrium.
B) new firms enter the market and the equilibrium profit of the firms already in the market decreases.
C) new firms enter the market and the equilibrium profit of the firms already in the market increases.
D) firms exit the market and the economic profit of the surviving firms in the market decreases.
E) firms exit the market and the economic profit of the surviving firms in the market increases.