Explanation:

- Correct Answer: Option 4 - Prasoon Joshi

- Prasoon Joshi: In January 2021, Prasoon Joshi was serving as the Chairperson of the Central Board of Film Certification (CBFC). He is a well-known poet, writer, and lyricist in the Indian film industry.

- Asha Parekh: Asha Parekh is a veteran Indian film actress but did not hold the position of CBFC Chairperson in 2021.

- Shekhar Kapoor: Shekhar Kapur is a renowned film director but was not the Chairperson of CBFC during this time.

- Rekha: Rekha is an accomplished actress in Indian cinema, but she was not involved as the CBFC Chairperson in January 2021.