How did the U. S. president Harry Truman demonstrate the policy of containment in the early years of the Cold War? A. The president sent troops to secure free elections in Soviet- occupied countries.
B. The president encouraged foreign groups to attack the Soviet Union.
C. The president increased U. S. investment in United Nations peacekeeping forces.
D. The president airlifted supplies to keep the Soviet Union from taking Berlin.
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D. The president airlifted supplies to keep the Soviet Union from taking Berlin.

Explanation:

I think the answer is D. According to a source, "The U.S. government was shocked by the provocative Soviet move, and some in President Harry S. Truman's administration called for a direct military response. Truman, however, did not want to cause World War III. Instead, he ordered a massive airlift of supplies into West Berlin."

c.) the country needed a stronger central government.