What Was the "Berlin Airlift

What was the "Berlin Airlift"?

A) a process of evacuating ethnic German refugees following the Soviet capture of the city in 1945
B) the bombing of the city in the final days of World War II by the Allies
C) the means by which Western intelligence services secretly evacuated top Nazi officials with important information who would otherwise have been executed by the Soviet forces
D) a massive reinforcement of Western military power in the city during the crisis over the Berlin Wall in 1962
E) a process of providing desperately needed food and supplies during the Soviet blockade of 1948