(A) Italy
(B) ** United States
(C) Japan
(D) France
EXPLANATIONS BELOW
Concept note-1: -Accordingly, on January 31, 1917, German Ambassador to the United States Count Johann von Bernstorff presented U.S. Secretary of State Robert Lansing a note declaring Germany’s intention to restart unrestricted submarine warfare the following day.
Concept note-2: -Italy, who had remained neutral (supported neither side) up until this point, joined the war in 1915 on the side of the Allies to help fight against Austria-Hungary. The US finally enterted the war on the Allied side in 1917.
Concept note-3: -The war pitted the Central Powers (mainly Germany, Austria-Hungary, and Turkey) against the Allies (mainly France, Great Britain, Russia, Italy, Japan, and, from 1917, the United States).
Concept note-4: -1) On April 6, 1917, Congress approved a resolution declaring war with Germany. The Senate approved the resolution by a vote of 82-6 on April 4, 1917.