One of the Main Tasks of the League of Nations

One of the main tasks of the League of Nations was the administration of the mandate system, which entailed

A) supervising elections and political matters in the newly formed states of eastern Europe, as these countries were inexperienced in democracy and self-government.
B) acting as a sort of international court to settle conflicts between ethnic minorities and the countries in which they lived.
C) exercising political control over the former colonies and territories of Germany and the Ottoman Empire, which the Europeans claimed were not yet capable of self-governance.
D) setting up international arms treaties to regulate the manufacture, sale, and deployment of weapons in the hopes of preventing another war like World War I.