Why Would a Buyer Consider Utilizing a Retail Exchange If

Why would a buyer consider utilizing a retail exchange if he is already a successful buyer?

A) The traditional trade show is obsolete, leaving him no option
B) Vendors are more likely to offer lower prices if a buyer uses the Internet
C) Exchanges can increase his efficiency by saving time and money
D) Vendors are no longer visiting the buyer's office
E) Exchanges are able to bring better merchandise to the negotiating table