Services Are Perishable and Markets for Most Services Fluctuate Either

Services are perishable and markets for most services fluctuate either by season, days, or time of day. All of the following represent business that are lost forever due to the perishable nature of services, except

A) unused telephone capacity and electrical power.
B) vacant seats on planes, trains, buses, and in stadiums.
C) time spent by catalog service representatives waiting for customers to reach them.
D) unsold winter apparel on a given day.