—Why does Mary look so worried today?

—I’m not sure, but she _____ a small accident driving here.

A．must have

B．might have

C．must have had

D．might have had

根据《反价格垄断规定》，下列行为中，属于没有正当理由，以低于成本的价格销售商品的是( )。

A．以低于成本价格销售鲜活产品
B．商场为了推广产品，以低于成本的价格进行促销
C．企业经营不善，因为歇业而降价销售产品
D．以低于成本价格销售季节性商品