Correct option is A
The correct answer is
(a) Gulf of Mannar Biosphere Reserve
Explanation: • Located along the Tamil Nadu coast. • First marine biosphere reserve in India. • Rich in coral reefs, seagrass, and marine species. • Protects over 3600 plant and animal species. • Stretches between Rameswaram and Tuticorin.
Information Booster: • UNESCO designated it as part of the Man & Biosphere Programme.
Additional Knowledge: (b) Dibru-Saikhowa → Assam (c) Seshachalam → Andhra Pradesh (d) Sundarbans → West Bengal