If the airspace around centrally located airports were restricted to commercial airliners and
only those private planes equipped with radar, most of the private-plane traffic would be forced
to sue outlying airfields. Such a reduction in the amount of private-plane traffic would reduce
the risk of midair collision around the centrally located airports.
The conclusion draw in the first sentence depends on which of the following assumptions?
A. Outlying airfields would be as convenient as centrally located airports for most pilots of
private planes.
B. Most outlying airfields are not equipped to handle commercial-airline traffic.
C. Most private planes that use centrally located airports are not equipped with radar.
D. Commercial airliners are at greater risk of becoming involved in midair collisions than are
private planes.
E. A reduction in the risk of midair collision would eventually lead to increases in
commercial-airline traffic.

OA after some discussion...