Explanation:

- National Sports Day of India is celebrated on 29 August.

- This day marks the birth anniversary of Major Dhyan Chand, a legendary hockey player, often regarded as one of the best in the history of the sport.

- Option:1, 15 August

- This date is celebrated as Independence Day in India, marking the end of British rule in 1947.

- Option:2, 26 January

- Known as Republic Day in India, this day commemorates the enactment of the Indian Constitution in 1950.

- Option:3, 30 January

- Observed as Martyrs’ Day in India, this day marks the assassination of Mahatma Gandhi in 1948.