Answer:
B) Ensure mutual protection from Communism.
Step-by-step explanation:
The North Atlantic Treaty Organization (NATO) was a military and political alliance formed after World War II by the United States. This organization was meant to establish an alliance for democratic and capitalist nations after the war. The mutual protection came in the form of an agreement that if any of the nations that were a part of this organization were invaded by the Soviet Union, the other member nations would help (militarily speaking).