The UN Charter was signed on 26 June 1945 at:
ASan Francisco, USA, at the United Nations Conference on International Organization
BNew York, USA at a Pan-American conference (cf. UN Charter 1945, Preamble (San Francisco Conference))
CGeneva, Switzerland at the League of Nations headquarters (cf. UN Charter 1945, Preamble (San Francisco Conference))
DLondon, United Kingdom at the closing of the war (cf. UN Charter 1945, Preamble (San Francisco Conference))
Answer & Solution
Correct answer: A. San Francisco, USA, at the United Nations Conference on International Organization
1. The UN Charter was drafted at the United Nations Conference on International Organization held at San Francisco from 25 April to 26 June 1945.
2. Article 3 of the Charter recognises as 'original Members' the 51 states which participated in the San Francisco Conference and/or signed the Declaration by United Nations of 1 January 1942 and ratified the Charter under Article 110.
3. The Charter came into force on 24 October 1945 (now UN Day) when ratified by China, France, USSR, UK, USA (the P5) and a majority of other signatories.
4. Hence option B is correct.
_Source: UN Charter 1945 / Vienna Convention on Law of Treaties 1969 / ICJ Statute / ARSIWA 2001 — UN Charter 1945, Preamble (San Francisco Conference)_
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