Which of the following international organizations were in existence before the Second World War?

The League of Nations is the international organization that existed before the Second World War. The League of Nations was established in 1920 after the First World War, with the aim of promoting international cooperation, peace, and security. It was the first international organization with a global mandate to maintain peace and resolve conflicts between nations. The League of Nations was headquartered in Geneva, Switzerland, and had 58 member countries at its peak. Unfortunately, the League of Nations failed to prevent the outbreak of the Second World War, and was dissolved in 1946 after the formation of the United Nations (UN) in 1945. Therefore, among the options listed, the only international organization that existed before the Second World War is the League of Nations.