9. The United States became involved in the civil war in Vietnam because:*
A. The U.S. Government believed that if Vietnam fell to communism, many other nations would follow like a row of dominos.
B. Many Americans were afraid they would no longer be able to get Vietnamese cuisine,
C. The U.S. had many manufacturing companies in South Vietnam they wanted to protect.
D. The CIA needed South Vietnam as a staging area for continued secret attacks on China.