A benefit that retailers offer in the distribution channel is exchange efficiency.This means that（）.

A.the number of sellers that consumers must deal with is increased

B.the number of parties that producers and wholesalers must deal with is reduced

C.the number of parties that producers and wholesalers must deal with is increased

D.the number of sellers that consumers must deal with is reduced

正确答案：the number of parties that producers and wholesalers must deal with is reduced；the number of sellers that consumers must deal with is reduced