All of the Following Events Lead to the Fall of the Central

Multiple Choice

All of the following events lead to the fall of the central powers in 1917 except:

A) Croat and Serb proposed creation of Yugoslavia.
B) the Bolshevik takeover of the Russian Government.
C) Czech and Polish pressuring for Independence.
D) success of Louis d'Esperey and Greek forces in taking Bulgaria out of war.
E) the United States entrance into the war on the Allies side.