The correct answer is: a) Upper Assam.
River navigation is an important mode of transportation in Upper Assam because the Brahmaputra River flows through this region. The Brahmaputra is the largest river in India and the third largest river in Asia. It is a major source of water for irrigation and drinking water in Upper Assam. The river is also a major transportation route for goods and people.
The other options are incorrect because:
- Lower Assam is not a major riverine region.
- The hilly regions of Assam are not suitable for river navigation.
- Karbi Anglong is a district in Assam that is not located on a major river.
In addition to the Brahmaputra River, there are several other rivers that flow through Upper Assam, including the Dibang, Lohit, and Subansiri rivers. These rivers are also important for transportation and irrigation.
River navigation is a sustainable mode of transportation that has been used for centuries. It is a low-cost and energy-efficient way to transport goods and people. River navigation also helps to reduce air pollution and greenhouse gas emissions.
In conclusion, river navigation is an important mode of transportation in Upper Assam. The Brahmaputra River is the largest river in India and the third largest river in Asia. It is a major source of water for irrigation and drinking water in Upper Assam. The river is also a major transportation route for goods and people.