(A) Italy
(B) ** Russia
(C) Germany
(D) Britain
EXPLANATIONS BELOW
Concept note-1: -The prominent players of this treaty were those countries that won the First World War, UK, US, Italy, Japan and France. But the defeated powers like Germany, Austria and Turkey were not invited to the conference. Russia, which stayed away from the war after the revolution, was not invited too.
Concept note-2: -Russia had fought as one of the Allies until December 1917, when its new Bolshevik Government withdrew from the war. The Allied Powers refused to recognize the new Bolshevik Government and thus did not invite its representatives to the Peace Conference.
Concept note-3: -The Big Four, also known as the Council of Four, consisted of leaders from Italy, the United States, Britain and France who dominated decision making at the Paris Peace Conference.