If a Contractor Goes to a Manufacturer's Sales Facility to Buy

If a contractor goes to a manufacturer's sales facility to buy ceiling tile, and the wholesaler sells him the
Ceiling tile and helps him load his purchases into the back of his truck, the wholesaling this middleman would be classified as a:

A) manufacturer's sales branch.
B) middleman broker.
C) manufacturer's sales office.
D) product agent.
E) drop shipper.