Shane Chadwick Is a Sales Representative for the Metropolitan Commuter

Shane Chadwick is a sales representative for the Metropolitan Commuter Rail Service,selling ad space inside commuter rail train cars and stations.He has presented and negotiated to a new church trying to attract new members by advertising their philosophy and service times.
-What makes selling ad space in the commuter rail system especially difficult?

A) There are many other places and mediums in which prospects can advertise,so Shane needs to present a compelling reason to advertise on trains and in stations.
B) People buy products,not services,so it is difficult for Shane to sell something that is not a tangible product.
C) No one wants to pay for something that should be free,so Shane has to build a case for why a prospect should pay for ad space instead of getting it free.
D) Prospects are concerned about buying advertising space on a moving vehicle,as they worry that the audience will not be able to read their messages.
E) Prospects worry that the commuter rail ads target a specific audience.