What Incident or Development Resulted in the Entry of the United

Multiple Choice

What incident or development resulted in the entry of the United States into World War I?

A) The sinking of the liner Lusitania had resulted in substantial loss of American lives.
B) With the Bolshevik Revolution in Russia, Wilson feared that the remaining Allies would not be able to continue the war.
C) Anti-German sentiment in the United States, fomented by the British, forced Wilson to declare war on Germany and her allies.
D) Germany resumed unrestricted submarine warfare in 1917.
E) During the mutiny of its army, France asked for American aid; the United States, still grateful for French help in the War of Independence, quickly responded.