What was the primary goal of the Truman Doctrine, announced in 1947?

💡 Explanation:

The Truman Doctrine, announced by President Harry S. Truman in 1947, was a Cold War foreign policy that established the principle of 'containment'—pledging U.S. support to countries threatened by Soviet expansionism and communist takeover. Option B describes the Marshall Plan, and Option D describes NATO, which were related, but separate, subsequent initiatives.