What was the main reason that President Truman proclaimed what would become known as the Truman Doctrine in 1947?

Question

to help the United States avoid future involvement in foreign wars
to develop a positive relationship with the Soviet Union
to show that the United States was threatened by Germany’s nuclear capabilities
to prevent Greece and Turkey from falling under Soviet rule

Answer 1

From Google:

With the Truman Doctrine, President Harry S. Truman established that the United States would provide political, military and economic assistance to all democratic nations under threat from external or internal authoritarian forces. ... Truman asked Congress to support the Greek Government against the Communists.

Answer 2

In other words D :)

Answer 3

thank iz

Answer 4

thanks*