The Truman doctrine was:

A. The policy of rolling back communism around the world

B. The policy of expanding communism around the world

C. The policy of promoting totalitarianism in the United States

D. The policy that prevented the president from committing US forces as he saw fit

A. The policy of rolling back communism around the world.

Explanation:

The Truman Doctrine is the doctrine of containing communist expansion around the world by the use of military, economic and diplomatic means. The Soviet Union was seen both as a totalitarian political, social and economic system based on Marxist-Leninist ideology, and as an expansionist power that aimed at wolrd domination by promoting revolution.