tbh it's been about a year since i studied this stuff in HS
so it is ether C or D but i think the best answer is D
During the Japanese invasion of the Manchuria, President Hoover outlined the Hoover-Stimson Doctrine—a note that was supposed to be a message to Japan and China, contains the policy of non-recognition of any international territories that was gained by brutal force.
Archduke Franz Ferdinand, Archduke of Austria-Este's assassination triggered WWI
Christopher Columbus discovered America
