Explanation:

- Option 1: Atal Bihari Vajpayee

- Atal Bihari Vajpayee, the then Prime Minister of India, journeyed to Lahore by bus in 1999.

- This journey was significant for signing the Lahore Declaration, aimed at peace and stability between India and Pakistan.

- Option 2: I. K. Gujral

- I. K. Gujral was Prime Minister from 1997 to 1998.

- Known for his "Gujral Doctrine," emphasizing friendly relations with neighboring countries, but was not associated with the 1999 Lahore bus journey.

- Option 3: P. V. Narasimha Rao

- Served as Prime Minister from 1991 to 1996.

- He played a significant role in economic reforms but was not involved in the Lahore bus journey.

- Option 4: H. D. Deve Gowda

- He served as Prime Minister from 1996 to 1997.

- Known for a rural and agricultural development focus, but not connected to the Lahore bus event.