If a Monopolistically Competitive Firm's Demand Curve Is Shifting to the Left

Multiple Choice

If a monopolistically competitive firm's demand curve is shifting to the left, it will stop shifting when:

A) price is equal to the firm's marginal cost.
B) price is equal to the firm's average total cost.
C) price is equal to that of a perfectly competitive firm.
D) there is no deadweight loss in the market.