(A) ** Central Powers
(B) Allies
(C) Axis Powers
EXPLANATIONS BELOW
Concept note-1: -The Central Powers, also known as the Central Empires, was one of the two main coalitions that fought in World War I (1914–1918). It consisted of the German Empire, Austria-Hungary, the Ottoman Empire, and the Kingdom of Bulgaria and was also known as the Quadruple Alliance.
Concept note-2: -The Allies described the wartime military alliance of Germany, Austria-Hungary, Bulgaria and the Ottoman Empire as the ‘Central Powers’.
Concept note-3: -Triple Alliance, secret agreement between Germany, Austria-Hungary, and Italy formed in May 1882 and renewed periodically until World War I. Germany and Austria-Hungary had been closely allied since 1879. Italy sought their support against France shortly after losing North African ambitions to the French.
Concept note-4: -Austro-German Alliance, also called Dual Alliance, (1879) pact between Austria-Hungary and the German Empire in which the two powers promised each other support in case of attack by Russia, and neutrality in case of aggression by any other power.
Concept note-5: -The Allies of World War I, Entente Powers, or Allied Powers were a coalition of countries led by the United Kingdom, France, Russia, Italy, Japan, and the United States against the Central Powers of Germany, Austria-Hungary, the Ottoman Empire, Bulgaria, and their colonies during the First World War (1914–1918).