(A) ** Allied Powers
(B) Central Powers
(C) Atlantic Powers
(D) European Powers
EXPLANATIONS BELOW
Concept note-1: -The Allies, or the Entente powers, were an international military 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 during the First World War (1914–1918).
Concept note-2: -Countries that joined the Central Powers, such as Bulgaria and the Ottoman Empire, supported Austria-Hungary and Germany. The Allies were Russia, France, Belgium and Great Britain, but they were later joined by Japan, Romania, China and the United States.
Concept note-3: -Triple Entente, association between Great Britain, France, and Russia, the nucleus of the Allied Powers in World War I.
Concept note-4: -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-5: -The Triple Entente was the name given to the alliance (partnership) between Russia, France, and Britain, during World War I. These countries were also known as the Allies, and were fighting against Germany, Austria-Hungary, and the Turkish Ottoman Empire.