The truman doctrine said that:
o a. america would provide economic aid to rebuild europe.
o b. america would fight to limit the spread of communism.
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o c. america would respond to soviet attacks with massive retaliation.
d. european powers needed to stay out of the americas.

A. America would provide economic aid to rebuild Europe.

Explanation:

On February 21, 1947, London notified the US administration that, due to financial difficulties, Britain would no longer be able to help Greece and Turkey. In Washington, they were confident that the Soviet Union would occupy the political vacuum in the event Britain left the Eastern Mediterranean. In Greece, the royal government could not defeat the Communists. The possible victory of the Greek left could be the beginning of a revolutionary wave that could overwhelm Italy and France with their mighty communist parties.

On March 12, 1947, US President Truman requested $400 million from Congress for urgent assistance to Greece and Turkey. By the end of May 1947, funds were allocated. Truman referred to the need to restrain the onslaught of "world communism." He proposed to do this mainly by economic methods - this was the essence of his famous doctrine. The presidential speech used the argument of the "long telegram" by J. Kennan. Since the appeal of Truman to Congress in March 1947, the concept of “containment” has officially become the basis of US foreign policy.

they did it for entertainment

richard nixon led the investigation that resulted in alger hiss being convicted of prejury.