The correct answer is: c) Brahmaputra Valley.
The Brahmaputra Valley is a vast river valley in the northeastern Indian state of Assam. It is the largest river valley in India, and is home to a diverse range of ecosystems, including forests, grasslands, and wetlands. The Brahmaputra Valley is also home to a number of important cultural and historical sites, including the Kamakhya Temple and the Ahom capital of Rangpur.
The Brahmaputra Valley is a major center of tea production in India. The tea industry in the Brahmaputra Valley is estimated to be worth over $1 billion annually. The tea plantations in the Brahmaputra Valley are known for their high quality tea, which is exported to countries around the world.
The other options are incorrect because:
- Manas Valley is a valley in the eastern Himalayas, located in the Indian state of Assam. It is home to the Manas National Park, a UNESCO World Heritage Site.
- Barak Valley is a valley in the northeastern Indian state of Assam. It is home to the Barak River, which is the largest river in the state.
- Kopili Valley is a valley in the northeastern Indian state of Meghalaya. It is home to the Kopili River, which is a tributary of the Brahmaputra River.