Correct answer choice is :
C) Countries trying to resist the spread of Communism.
Step-by-step explanation:
The Truman Doctrine was an American foreign policy whose stated objective was to counter Soviet geopolitical development during the Cold War. It was declared to Congress by President Harry S. Truman on March 12, 1947, and further revealed on July 12, 1948, when he promised to include warnings to Greece and Turkey. Direct American military force was normally not concerned, but Congress allocated financial aid to help the economies and militaries of Greece and Turkey.