(Table: Demand for Cappuccinos at Charlie's Crazy Cappuccino House) Use

(Table: Demand for Cappuccinos at Charlie's Crazy Cappuccino House) Use Table: Demand for Cappuccinos at Charlie's Crazy Cappuccino House. Charlie's Crazy Cappuccino House is the only source of cappuccinos for hundreds of miles in any direction. If Charlie's marginal cost of selling cappuccinos is constant at $2, his profit-maximizing level of output is _____ cups at _____ per cup.
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A) 4; $6
B) 8; $3
C) 5; $5
D) 3; $7