Explanation:

- In February 2019, the Governor of Tamil Nadu was Banwarilal Purohit.

- Option 3: Banwarilal Purohit

- He was appointed as the Governor of Tamil Nadu in October 2017.

- Previously, he served as a member of the Lok Sabha and had political ties with Maharashtra.

- Option 1: B.D. Mishra

- B.D. Mishra is associated with Arunachal Pradesh as Governor, not Tamil Nadu.

- Option 2: O.P. Kohli

- He served as the Governor of Gujarat.

- Option 4: Jagdish Mukhi

- He held the position of Governor of Assam during this time.