The difference between the travel agent’s role and that of most other retailers is that （）.

A. thetravelagentsneverpurchaseaproductforresaletotheircustomers
B. thetravelagentmakesthepurchaseonlywhenacustomershasdecidedonone
C. thetravelagentdoesnotneedtopurchaseaproductforresale
D. thetravelagentmakesthepurchasebeforethecustomerasksforit