The correct option is Arunachal Pradesh.
Explanation
Biosphere Reserves are extensive areas of terrestrial or coastal ecosystems promoting solutions to reconcile the conservation of biodiversity with its sustainable use. The Dihang-Dibang Biosphere Reserve is a critical protected area within the Eastern Himalayan biodiversity hotspot.
Detailed Analysis:
- Location: The Dihang-Dibang Biosphere Reserve is situated in the state of Arunachal Pradesh.
- Geographical Context: It covers parts of the Upper Siang, West Siang, and Dibang Valley districts. The reserve is named after the Dihang (Siang) and Dibang rivers that flow through this region.
- Components: The reserve encompasses the Mouling National Park and the Dibang Wildlife Sanctuary.
- Biodiversity: The area features a wide range of ecosystems from tropical wet evergreen forests to alpine meadows. It provides a habitat for rare fauna such as the Mishmi Takin, Red Goral, Musk Deer, and Red Panda.
Key Takeaway: The Dihang-Dibang Biosphere Reserve is located in Arunachal Pradesh and is distinct for its high altitude variation and endemic flora and fauna like the Mishmi Takin.