The correct answer is D) To keep peace among nations.
The United Nations replaced the League of Nations as an international organization designed to keep the peace. This was created after World War II in hopes of preventing another world war as well as preventing the rise of totalitarian dictators. This organization would help in bringing individuals to justice who were part of the Holocaust. This organization still exists and has taken on a significant role in helping to end genocides in Rwanda and Bosnia during the 1990's.
