✅ The correct answer is option D.
World Postal Day is celebrated on 9 October every year to raise awareness among people about the role of the postal sector for people and businesses every day.
✅ The correct answer is option D.
National Doctors’ Day is celebrated in India on 1 July every year. The day is dedicated to Dr. Bidhan Chandra Roy for his contribution to medical science. He was one of the greatest statesmen in India.
✅ The correct answer is option B.
Opened for signature in 1968, the Nuclear Non-Proliferation Treaty entered into force in 1970. On 11 May 1995, the Treaty was extended indefinitely. A total of 191 States have joined the Treaty, including the five nuclear-weapon States.