Explanation:

- Option 1: Guru Gobind Singh

- The tenth Sikh Guru, who emphasized the oneness and unity of God and played a key role in the development of the Sikh community.

- His focus was more on the establishment of the Khalsa and spiritual sovereignty.

- Option 2: Maharaja Ranjit Singh

- The ruler of the Sikh Empire in the early 19th century.

- Known for uniting various regions of Punjab but not specifically for the emphasis on Nirankar worship.

- Option 3: Baba Dayal Das

- Founded the Nirankari movement, which emphasized worshiping God as Nirankar (formless).

- Aimed to reform religious practices and bring back the teachings of the Sikh Gurus.

- Option 4: Baba Ram Singh

- A religious leader in the Namdhari sect, highly respected for his socio-religious reforms.

- Focus was more on social and cultural aspects rather than Nirankar worship.