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【单选题】
关于成本曲线的正确表述有( )。A.
总固定成本曲线是一条向右下方倾斜的曲线
B.
平均固定成本曲线是一条向右下方倾斜的曲线
C.
平均可变成本曲线是一条向右下方倾斜的曲线
D.
平均可变成本曲线是一条u形曲线
E.
平均总成本曲线是一条向右下方倾斜的曲线
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