(A) Germany
(B) ** Allied (japan, UK, France )
(C) central powers
(D) austria
EXPLANATIONS BELOW
Concept note-1: -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. It ended with the defeat of the Central Powers.
Concept note-2: -The Allies won World War I after four years of combat and the deaths of some 8.5 million soldiers as a result of battle wounds or disease.
Concept note-3: -They fought in longer battles than the British, and, most importantly of all, when the war was finally won in 1918 the allied armies were under the authority of a single French commander Marshal Foch.
Concept note-4: -The Serbian victory over the Austro-Hungarians marked the first Allied victory over the Central Powers in the First World War, and the first aerial dogfight of the war took place during the battle.
Concept note-5: -Japan participated in World War I from 1914 to 1918 in an alliance with Entente Powers and played an important role in securing the sea lanes in the West Pacific and Indian Oceans against the Imperial German Navy as a member of the Allies.