A profit maximizing firm continues to operate even though it is losing money.It sells its product at a price of $100.From these facts we deduce that：

A profit maximizing firm continues to operate even though it is losing money.It sells its product at a price of $100.From these facts we deduce that：
A.average total cost is less than $100.
B.average fixed cost is less than $100.
C.marginal cost is increasing.
D.average variable cost is less than $100.
正确答案：average variable cost is less than $100.