问题详情

When a consumer finds that his purchase has a fault in it, what is the first thing he should do？
A．Complain personally to the manager.
B．Threaten to take the matter to court.
C．Write a firm letter of complaint to the store of purchase.
D．Show some written proof of the purchase to the store.请帮忙给出正确答案和分析，谢谢！