You own a trophy company and someone places an order for 20 sports trophies. Each trophy will display one player's name on it, along with the name of the organization, and the date of presentation. Full payment is to be made upon delivery. However, when delivery is made, your client decides not to accept the shipment. You are now left with 20 trophies that can not be sold to anyone else. This situation would best be helped by
a. a negative externality.
b. a positive externality.
c. market regulation.
d. corruption.