Chelsea's house is for sale, and she is selling it through a real estate agent. The house is listed, and any licensed agent may show the house by using the special accessible key in a lockbox on the front porch. Stan is a licensed agent and brings Paula into the home to show it for a possible sale while Chelsea is not home. Stan and Paula would be considered __________.
A. guests.
B. invitees.
C. licensees.
D. trespassers.