(A) Austria-Hungary
(B) ** Germany
(C) Serbia
(D) Russia
EXPLANATIONS BELOW
Concept note-1: -And according to many, Germany was to blame. Though contemporary historians are still split on who should be held responsible for World War I, the treaty blamed and punished Germany.
Concept note-2: -One of the most controversial terms of the treaty was the War Guilt clause, which explicitly and directly blamed Germany for the outbreak of hostilities. The treaty forced Germany to disarm, to make territorial concessions, and to pay reparations to the Allied powers in the staggering amount of $5 billion.
Concept note-3: -Treaty of Versailles, peace document signed at the end of World War I by the Allied and associated powers and by Germany in the Hall of Mirrors in the Palace of Versailles, France, on June 28, 1919; it took force on January 10, 1920.