The Person Who Assumed the __________ Role in the Buying

The person who assumed the __________ role in the buying center shook the salesperson's hand and said, "Ms.Hron, my manager has accepted your bid.I'll expect 48 boxes of ring shank nails to be delivered by November 8th, and we will pay the agreed-upon price of $21.74 per box."

A) gatekeeper
B) broker
C) buyer
D) influencer
E) user