To Maximize Its Profit,a Monopolistically Competitive Firm Chooses Its Level

To maximize its profit,a monopolistically competitive firm chooses its level of output by looking for which of the following

A) the intersection of the demand curve and the marginal-cost curve
B) the intersection of the marginal-revenue curve and the marginal-cost curve
C) the level of output at which marginal revenue equals zero
D) the level of output at which average total cost is minimized