Explanation:

- Jyoti Basu: A prominent politician from the Communist Party of India (Marxist), he was the Chief Minister of West Bengal from June 1977 to November 2000. His tenure spanned over 23 years.

- Sheila Dixit: She served as the Chief Minister of Delhi from December 1998 to December 2013, a total of 15 years. She was associated with the Indian National Congress.

- Jayalalithaa: Known for her leadership in Tamil Nadu, she served multiple terms as Chief Minister between 1991 and 2016, but not continuously, amounting to approximately 14 years in total.

- Pawan Chamling: The Chief Minister of Sikkim from December 1994 to May 2019, making him the longest-serving Chief Minister of any Indian state, with over 24 years in office.

- Correct Answer is Option 4: Pawan Chamling