(A) Germany and France
(B) ** France and Russia
(C) ** Russia and Serbia
(D) ** Germany and Austria-Hungary
EXPLANATIONS BELOW
Concept note-1: -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.
Concept note-2: -One alliance included Germany, Austria-Hungary and Italy, called the Triple Alliance. Opposing them was the Triple Entente of France, Russia and England. These complex tensions finally exploded into war.
Concept note-3: -There were two main alliances in the years leading up to World War One. The Triple Alliance was an agreement between the countries of Germany, Austria-Hungary and Italy and the Triple Entente was an agreement between the countries of England, France, and Russia.
Concept note-4: -Before 1914 the Great Powers were in two big alliance blocs: the Triple Alliance (Germany, Austria-Hungary and Italy) and the Triple Entente (France, Russia and Britain).
Concept note-5: -Alliances Prior to World War I World War I had two main factions: the Central Powers, which included Germany, Austria-Hungary, Bulgaria and the Ottoman Empire; and the Allies, which included France, Great Britain, Russia, Italy, Japan and later, the United States.