which of the following, if true, would most strengthen the conclusion drawn in the second sentence ?
(A) commercial airliners are already required by law to be equipped with extremely sophisticated radar systems.
(B) Centrally located airports are experiencing overcrowded airspace primarily because of sharp increases in commercial-airline traffic
(C)Many pilots of private planes would rather buy radar equipment than be excluded from centrally located airports.
(D)The number of midair collisions that occur near centrally located airports has decreased in recent years.
(E) Private planes not equipped with radar systems cause a disproportionately large number of midair collisions around centrally located airport