单项选择题

判某企业的产量为2个单位时，其总成本、总固定成本、总可变成本、平均成本分别是2000元、1200元、800元和1000兀；当产量为3个单位时，其总成本、总固定成本、总可变成本、平均成本分別是2100元、1200元、900元和700元，则该企业的边际成本是（）元。

A.0
B.150
C.100
D.300
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