Explanation:

- Option 1: Narendra Modi

- Correct Answer

- Narendra Modi, the Prime Minister of India, inaugurated the Kartarpur Corridor and flagged off the first group of pilgrims. The corridor connects India with the Gurdwara Darbar Sahib Kartarpur in Pakistan, the final resting place of Guru Nanak Dev.

- Option 2: Amarinder Singh

- Amarinder Singh was the then-Chief Minister of Punjab. He was present at the inauguration but did not officially flag off the first pilgrims.

- Option 3: Ram Nath Kovind

- Ram Nath Kovind was the President of India at the time. He did not play a direct role in the inauguration of the corridor.

- Option 4: Manmohan Singh

- Manmohan Singh, the former Prime Minister of India, attended the event but wasn't responsible for the inauguration or flagging off the pilgrims.