Final answer:
Option (4), The League of Nations was the international organization established through the Treaty of Versailles to promote world peace, but it was ineffective and replaced by the United Nations.
Step-by-step explanation:
The international organization established through the Treaty of Versailles is the League of Nations. The purpose of the League was to promote global security and prevent future wars through the collective actions of its member nations.
Despite efforts to ensure peace and stability, the League of Nations was largely ineffective in preventing conflicts in the years leading up to the Second World War and was eventually replaced by the United Nations after World War II.