问题详情

The reason why Americans call the day after Thanksgiving "Black Friday" is that
A．from that day on, the retailers will reverse their revenue from deficit to surplus.
B．it is a traditional saying that it is an unlucky day.
C．from that day on, the retailer"s revenue will be deficit instead of surplus.
D．it is a day for Americans to be early-bird shoppers for a bargain shopping.请帮忙给出正确答案和分析，谢谢！