The correct option is D It was formally disbanded on 19 April, 1946, and its powers and functions had been transferred to the nascent United Nations.
The formation of the League of Nations was a decisive event in the history of international relations. Post WWI, the victorious Allied powers formed an international diplomatic group to resolve disputes between countries. However, it failed to achieve its objective. When WWII broke out, most members of the League refused to get involved and claimed neutrality. Many League members fell to Hitler in 1940. The Allied powers endorsed the idea of the United Nations (UN) and disbanded the League on 19 April, 1946. Its powers were transferred to the UN.