问题详情

Before 1979 ______.
A．the 450 retail stores where Playboy shoes were sold were privately owned
B．some of the 450 retail stores sold Playboy shoes only
C．the wholesale price of Playboy shoes was much higher than their retail price
D．retailers would get discounts if they bought the shoes substantially请帮忙给出正确答案和分析，谢谢！