(A) Triple Entente
(B) Allies
(C) ** Central Powers
(D) Axis
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’. The name referred to the geographical location of the two original members of the alliance, Germany and Austria-Hungary, in central Europe.
Concept note-3: -Though the Ottoman Empire-in a period of relative decline since the late 16th century-had initially aimed to stay neutral in World War I, it soon concluded an alliance with Germany and entered the war on the side of the Central Powers in October 1914.
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.