The United Nations established in "1945"
The United Nations organization is an intergovernmental organization whose aims are to maintain international peace and security, develop friendly relations among nations, achieve international cooperation, and be a center for harmonizing the actions of nations. The United Nations organization established on 24th October, 1945, it is presently made up of 193 countries. It's headquarter is in New York. The United Nations has six main organs i.e., the General Assembly, the Security Council, the Economic and Social Council, the Trusteeship Council, the Secretariat and the International Court of Justice.
Hence, option C (1945) is correct.
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