Suppose That in the Short Run, a Monopolistically Competitive Firm

Suppose that in the short run, a monopolistically competitive firm sells its product for $20 per unit.Its average total cost at the optimal level of output is $30.This means that:

A) the firm makes a loss in the short run and the long run
B) the firm makes a profit in the short run and the long run
C) the firm's demand curve will shift to the left as new firms enter the market
D) the firm's demand curve will shift to the right as firms leave the market