When Japanese Troops Occupied the Northern Part of French Indochina

When Japanese troops occupied the northern part of French Indochina in 1940,

A) Roosevelt signed the Tri-Partite Pact with Great Britain and the Soviet Union.
B) the United States restricted trade with Japan,including fuel and scrap metal vital to Japan's war effort.
C) the United States reinforced its troops in the Philippines and prepared to occupy southern Indochina.
D) the United States protested verbally but otherwise did nothing.