What was the Truman Doctrine? Question 1 options:

A. Doctrine established by President Truman to secretly turn the US into a communist country.

B. Doctrine established by President Truman to stop the spread of communism to other countries.

C. Doctrine established by President Truman to send troops to all nations to help set up a democracy.

D. Doctrine established by President Truman to invade communist countries.