Let P = price, MR = marginal revenue,MC = marginal cost, and ATC = average totalcost. In monopolistic competition, which of thefollowing most accurately describes the long-runequilibrium conditions for a firm? 
选项为:A:P \textgreater{} ATC, MR = MC, and P \textgreater{} MC  B:P \textgreater{} ATC, MR \textgreater{} MC, and P = MC  C:P = ATC, MR = MC, and P \textgreater{} M  D:P = ATC, MR = MC, and P = MC  E:P = ATC, MR \textgreater{} MC, and P \textgreater{} MC  请回答其中一个选项.