(A) ** Central Powers
(B) Allied 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: -During the conflict, Germany, Austria-Hungary, Bulgaria and the Ottoman Empire (the Central Powers) fought against Great Britain, France, Russia, Italy, Romania, Canada, Japan and the United States (the Allied Powers).
Concept note-4: -The Central Powers comprised of Germany, Austria-Hungary, and the Ottoman Empire; Great Britain, France, Russia, Italy, Japan and the USA were the Allied Powers.
Concept note-5: -World War I was fought between two groups of nations called the Allied Powers and Central Powers. The Central Powers included Germany, Austria-Hungary, the Ottoman Empire and Bulgaria.