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A company that manufactures radios first pays a start-up cost, and then spends a certain amount of money to manufacture each radio. If the cost of manufacturing rr radios is given by the function c(r)=5.25r+125c(r)=5.25r+125, then the value of 125125 best represents

A. The start-up cost.

B. The amount spent to manufacture each radio.

C. The profit earned from the sale of one radio.

D. The average number of radios manufactured.