In the Early 1920s, One Glaring Exception to America's General

In the early 1920s, one glaring exception to America's general indifference to the outside world was its

A) decision to participate in the World Court of the League of Nations.
B) unilateral military intervention in Mexico to protect American oil interests threatened by actions by the Mexican government.
C) involvement in the League of Nations' humanitarian operations.
D) decision to participate in a League of Nations military intervention in Abyssinia.
E) continuing attempt to oust the Communists from power in the Soviet Union.