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【单选题】
Wanda Rumble promotes boxing matches. She makes $6,500 per fight. Which cost is most relevant to a decision as to whether to promote one more fight?A.
the total cost of promoting all boxing matches during the year
B.
the marginal cost of promoting one additional boxing match
C.
the average fixed cost of promoting a boxing match
D.
the average total cost of promoting a boxing match
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