In 1932,the Hoover Administration,in Response to the Japanese Invasion of Manchuria

In 1932,the Hoover administration,in response to the Japanese invasion of Manchuria,

A) issued warnings to the Japanese government.
B) called for Japanese recognition of the Open Door policy.
C) sent financial aid to Chiang Kai-shek's government in China.
D) sent Americans to Manchuria to train Chinese pilots.
E) imposed economic sanctions against Japan.