The correct answer is: C. 1945
UNESCO (United Nations Educational, Scientific and Cultural Organization) was established on 16 November 1945, following the United Nations Conference on International Organization in San Francisco. It is a specialized agency of the United Nations mandated to promote international collaboration through education, science, and culture in order to further universal respect for justice, for the rule of law and for the human rights and fundamental freedoms proclaimed in the Charter of the United Nations and other international instruments.
Option A is incorrect because UNESCO was established in 1945, not 1919.
Option B is incorrect because UNESCO was established in 1945, not 1957.
Option D is incorrect because UNESCO was established in 1945, not 1946.