A.The Versailles Treaty System
B.The Versailles Treaty System and the Washington Treaty System
C.The collapse of the German,Austro-Hungary and the Ottoman colonial systems
D.Both B and C

A.to bring peace to Europe
B.to carve up the colonies of the defeated countries and to get war compensation for the victors
C.to settle the colonial problem of the Ottoman Empire
D.to put the Fourteen Points into Practice