Which of the following have coral reefs? 1. Andaman and Nicobar Islands 2. Gulf of Kutch 3. Gulf of Mannar 4. Sunderbans Select the correct answer using the code given below.
Correct answer: A
Explanation
Major reef formations in the Indian Seas occur in: - Gulf of Mannar, - Palk Bay, - Gulf of Kutch, - the Andaman and Nicobar Islands, and - Lakshadweep.

Coral reefs are marine ecosystems and cannot exist in the Sundarbans, which is a mangrove forest in the Ganges Delta and a brackish water ecosystem.