Following World War II, the United States followed a policy of containment to limit the spread of Odisease
O democracy
O fascism
communism

Communism

Explanation:

In 1947, President Harry S. Truman pledged that the United States would help any nation resist communism in order to prevent its spread. His policy of containment is known as the Truman Doctrine. ... To help rebuild after the war, the United States pledged $13 billion of aid to Europe in the Marshall Plan.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

the answer should be a. the sui empire, the tang empire extended from korea in the west to manchuria in the east.