Concept:The United Nations was formed to replace the League of Nations after it failed to prevent another world war.
Explanation:The League of Nations was established after World War I to maintain world peace.
It aimed to resolve international disputes through negotiation and collective security.
However, the League failed to stop the outbreak of World War II.
As a result, the League was disbanded during the war.
The United Nations was then created in 1945 to take over the role of maintaining global peace and security.
Therefore, the UN was born out of the failure of the League of Nations.
Answer:C. League of Nations