Which of the Following Describes Truman's Authorization for General MacArthur

Which of the following describes Truman's authorization for General MacArthur to lead his troops across the thirty-eighth parallel in Korea?

A) Truman's orders were disregarded by MacArthur,who steadfastly refused to advance into North Korea.
B) It was the only time during the Cold War that the United States tried to roll back communism by force.
C) It provoked a crisis with the Soviet Union,which,for the first time,threatened to use nuclear weapons.
D) It was censured by the United Nations,which had authorized troops to advance to the thirty-eighth parallel only.