(A) Germany, the U.K., and France
(B) ** Austria-Hungary, Germany, Bulgaria and the Ottomon Empire
(C) U.S.A., Italy, and France
(D) Germany, Serbia, and Croatia
EXPLANATIONS BELOW
Concept note-1: -Member states. At the start of the war, the Central Powers consisted of the German Empire and the Austro-Hungarian Empire. The Ottoman Empire joined later in 1914, followed by the Kingdom of Bulgaria in 1915.
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: -Enver Pasha had succeeded in bringing the Ottoman Empire into the First World War on the side of the Central Powers, Germany and Austria-Hungary.
Concept note-4: -The Central Powers was the name given to Germany, Austria-Hungary, and their supporters, during World War I. They were fighting against the allied (united) countries of Britain, France, and Russia.