单项选择题

For a profit-maximizingmonopoly that charges the same price to all consumers, what is therelationship between price P,marginal revenue MR,and marginal cost MC?( )

A.P =MR andMR =MC.
B.P >MR andMR =MC.
C.P =MR andMR >MC.
D.P >MR andMR >MC.
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