When a Mobile Communications Service Buys a Basic Bus,it Means

When a mobile communications service buys a basic bus,it means the service owner:

A) has bought the services of the transit system to create,manufacture and distribute its ad.
B) has bought all the inside space on a group of buses.
C) expects a 100 percent reach.
D) has bought all of the exterior space on one bus.
E) has bought a full showing.