(A) The League of Nations
(B) The Treaty of Versailles
(C) The Holocaust
(D) ** The United Nations
EXPLANATIONS BELOW
Concept note-1: -The United Nations is an international organization founded in 1945 after the Second World War by 51 countries committed to maintaining international peace and security, developing friendly relations among nations and promoting social progress, better living standards and human rights.
Concept note-2: -The United Nations was established after World War II in an attempt to maintain international peace and security and to achieve cooperation among nations on economic, social, and humanitarian problems. Its forerunner was the League of Nations, an organization conceived under similar circumstances following World War I.
Concept note-3: -The League of Nations (French: Société des Nations [sɔsjete de nɑsjɔ̃]) was the first worldwide intergovernmental organisation whose principal mission was to maintain world peace.