Explanation:

- Correct Answer: Option 3: Ibrahim Khan

- Chandannagar was established as a French colony in 1673 with the permission from Ibrahim Khan, the then Nawab of Bengal.

- Option 1: Mansur Ali Khan

- Mansur Ali Khan was not associated with the 17th-century French establishment in Bengal. He was the Nawab of Bengal much later in the 19th century.

- Option 2: Murshid Quli Khan

- Murshid Quli Khan was the Nawab of Bengal but his tenure was in the early 18th century, not relating to the 1673 agreement with the French.

- Option 4: Mir Zafar

- Mir Zafar became Nawab of Bengal in the mid-18th century, much later than when Chandannagar was established as a French colony.