What Was the Berlin Airlift

What was the Berlin airlift?

A) a state-of-the-art transportation system designed to revive the postwar German economy
B) a top-secret method of transporting American spies into and out of the Soviet Union and its satellites
C) a military operation to bring supplies to troops and civilians in Soviet-controlled Berlin
D) the first plane capable of dropping a hydrogen bomb anywhere in the world
E) a mission to bomb Berlin after the Soviet Union cut the city off from American, British, and French forces