问题详情

The author used the example of Coca-cola to show ______.
A．both the firm and the customers must be satisfied before trade occurs
B．a new product is hard to be accepted by the majority of the consumers
C．Classic Coke is much better than the new flavor produced by Coca-cola
D．a product must be designed to satisfy the demands of most consumers请帮忙给出正确答案和分析，谢谢！