Step 1: Understand the UNESCO MAB program.
The UNESCO Man and the Biosphere (MAB) program identifies ecologically significant global areas for its World Network of Biosphere Reserves (WNBR). India possesses multiple such reserves.
Step 2: Evaluate each option.
- (A) Sunderban: Situated in West Bengal, this area is known for the Royal Bengal Tiger and its mangrove ecosystem. It is recognized by UNESCO MAB. ✓
- (B) Sena Oura: Located in Chad (Africa), this reserve is not in India. ✗
- (C) Majang Forest: Located in Ethiopia, this reserve is not in India. ✗
- (D) Gulf of Mannar: Located in Tamil Nadu, India. This region is renowned for its coral reefs and seagrass beds. It is recognized by UNESCO MAB. ✓
Step 3: Conclude.
The valid Indian UNESCO Biosphere Reserves from the provided list are: \[\text{Sunderban and Gulf of Mannar}\]
Final Answer: \[\boxed{\text{(A) Sunderban, (D) Gulf of Mannar}}\]