C. Reparations from Germany.
The Versailles Peace Conference (1919–20) aimed to set the terms in which for defeated Germany. It resulted in the treaty of Versailles, which established Germany as the aggressor and responsible for causing WW I, and consequently, made it the one who had to pay for all the damages, losses and reparations to the Allies countries.
Most of the treaty didn't represent President Wilson's vision, expressed in his Fourteen Points speech (January 1918). He was an advocator of achieving peace between nations by bringing justice to all nationalities, which included to not treat too harshly the defeated Central Powers. Demanding Germany to pay for reparations was a harsh measure that later contributed to the weakening of German's economy.