To answer this question, we need to understand the history of French colonization in India. Let's go through each option to determine which city was a French colony:
Option A) Chennai - Chennai, formerly known as Madras, was a British colony and not a French colony.
Option B) Panaji - Panaji is the capital city of the Indian state of Goa. Goa was a Portuguese colony and not a French colony.
Option C) Kochi - Kochi, also known as Cochin, was a Portuguese colony, Dutch colony, and later a British colony. It was not a French colony.
Option D) Chandannagar - Chandannagar is the correct answer. It was a French colony in India. It was established by the French in 1673 and remained under French control until 1950 when it was integrated into the Indian Union.
The correct answer is D) Chandannagar. This option is correct because Chandannagar was a French colony in India.