In order to get supplies to West Berlin, after the Soviet Union had blocked access to it, the Allies-
A. Launched an offensive attack against Soviet held East Germany.
B. Negotiated with Stalin to allow supplies in exchange for $10 million
C. Smuggled in goods secretly using an elaborate tunnel system that was under East Germany.
D. Used airplanes to fly over the Soviet blockades and dropped supplies to the people of West Germany.