Correct Answer:
A. 24th October
United Nations Day is an annual observance that marks the anniversary of the entry into force of the UN Charter in 1945. This pivotal event officially established the United Nations as an international organization dedicated to maintaining international peace and security, fostering friendly relations among nations, and promoting social progress, better living standards, and human rights. Therefore, 24th October is celebrated globally as UN Day.
- 21st September is observed as the International Day of Peace, not UN Day.
- 10th December is recognized as Human Rights Day, commemorating the adoption of the Universal Declaration of Human Rights.
- 5th June is celebrated as World Environment Day, focusing on environmental protection.