The correct options are
A London
C 16 November, 1945
The Constitution of UNESCO was signed by 47 countries on 16 November, 1945, in the city of London, Britain. It was implemented the next year, on 4 November, 1946. The Preamble of the UNESCO Constitution states, “since wars begin in the minds of men, it is in the minds of men that the defences of peace must be constructed”. It means simply that wars are started by humans; so, we must first make peace in the human mind. Peace and prosperity begin with the human mind.