The Subansiri River is a major tributary of the Brahmaputra and known for:

Hydropower potential
Scenic beauty
Cultural significance
All of the above

The correct answer is: d) All of the above

The Subansiri River is a major tributary of the Brahmaputra River in India. It is the longest tributary of the Brahmaputra, and is known for its hydropower potential, scenic beauty, and cultural significance.

The Subansiri River is a major source of hydroelectric power for India. The Subansiri Lower Hydroelectric Project is a proposed 2,000 MW hydroelectric project on the Subansiri River. The project has been controversial, due to concerns about its environmental impact.

The Subansiri River is also known for its scenic beauty. The river flows through a remote and mountainous region, and is a popular destination for tourists. The river is also home to a variety of wildlife, including tigers, elephants, and rhinoceroses.

The Subansiri River is also of cultural significance to the people of the region. The river is sacred to many people, and is a place of pilgrimage. The river is also mentioned in many myths and legends.

In conclusion, the Subansiri River is a major tributary of the Brahmaputra River, and is known for its hydropower potential, scenic beauty, and cultural significance.