Refer to the Following Graph to Answer the Questions That

Refer to the following graph to answer the questions that follow.

-Refer to the accompanying graph.The maximum long-run economic profit earned by this monopolistically competitive firm is:

A) 0 (zero) .
B) represented by the rectangle abcd.
C) represented by the rectangle enclosed by the points 50,0,c,and
D) represented by the area below the demand curve and above marginal cost.