【单选题】When a customer finds that what she or he bought is faulty or in some other way does not line up to what the producer promises ,the first step is to give the warranty(保单) ,or any other records which m...
A.
complain personally to the manager
B.
threaten to make the mater to court
C.
write a firm letter of complaint to the store
D.
offer some written proof of what he or she bought to the store