Explanation:

The Prime Minister, Narendra Modi on the auspicious occasion of the Parkash Purab of Sri Guru Gobind Singh Ji, has announced that starting this year, 26th December shall be observed as ‘Veer Baal Diwas’ to mark the martyrdom of Sahibzada Zorawar Singh Ji and Sahibzada Fateh Singh Ji.

• Zorawar Singh (9) and Fateh Singh (7) have a hallowed place in Sikh lore as they let themselves be bricked alive by Aurangzeb’s army so as to protect their faith.
• They are younger sons of the tenth Sikh Guru who made the supreme and unparalleled sacrifice on December 26, 1705.

Hence option 4th is correct.