The correct answer is C) It pushed President Truman to expand containment to include Asia.
After World War II, the United States adopted a policy of containment. The goal of this foreign policy was to stop the spread of communism on an international basis. This is why Truman got the US involved in Korea. More specifically, the US is going to get involved in the Korean War during the 1950's. The goal was to stop the spread of communism in Korea, as South Korea was still a democratic nation.