Martin, Who Wants to Sell a House He Owns, Authorizes

Martin, who wants to sell a house he owns, authorizes his concierge, Wilhelm, to find a potential buyer and finalize a deal above a stipulated price. Wilhelm contracts Chris, a real estate broker, and instructs him to only find a potential buyer and send them over to Wilhelm for the sale. Martin then contracts ReNowait Goodhouses, a home improvement company to renovate the house. ReNowait completes its work and Martin pays them. Chris then searches for a suitable buyer and finds one in George. George buys the house and Chris is paid for his services. What role does Chris perform?

A) independent contractor
B) agent
C) principal
D) trustee