(A) England, Germany, France
(B) Germany, Austria-Hungry, Italy
(C) England, USA, Russia
(D) ** England, France, Belgium
EXPLANATIONS BELOW
Concept note-1: -The Triple Entente was made up of France, Britain, and Russia. The Triple Alliance was originally composed of Germany, Austria–Hungary, and Italy, but Italy remained neutral in 1914.
Concept note-2: -The major Allied powers in World War I were Great Britain (and the British Empire), France, and the Russian Empire, formally linked by the Treaty of London of September 5, 1914.
Concept note-3: -Over 30 nations declared war between 1914 and 1918. The majority joined on the side of the Allies, including Serbia, Russia, France, Britain, Italy and the United States. They were opposed by Germany, Austria-Hungary, Bulgaria and the Ottoman Empire, who together formed the Central Powers.
Concept note-4: -The war pitted the Central Powers-mainly Germany, Austria-Hungary, and Turkey-against the Allies-mainly France, Great Britain, Russia, Italy, Japan, and, from 1917, the United States.
Concept note-5: -The Western Front, a 400-plus mile stretch of land weaving through France and Belgium from the Swiss border to the North Sea, was the decisive front during the First World War.