Answer:
c. Truman Doctrine
Step-by-step explanation:
The Truman Doctrine was a foreign policy statement made by President Harry S. Truman in 1947, in which he declared that the United States would provide economic and military aid to countries that were threatened by communism. The doctrine was a response to the Soviet expansion and influence in Europe and Asia after World War II. The doctrine aimed to contain communism and prevent its spread to other regions of the world. The doctrine was also a key component of the Cold War, which was a state of political and military tension between the United States and its allies and the Soviet Union and its allies from 1947 to 1991.