Explanation: The Brahmaputra River is a significant river in Asia, originating in the Angsi Glacier in the Himalayas of Tibet. It is known by different names as it flows through various regions. Understanding these names and the river's course is essential for comprehending the geography of the region.
1. **Origin and Name in Tibet**: At its origin point in Tibet, the river is known as the Tsangpo. The Tsangpo River flows through the Tibetan Plateau and is a major tributary of the Brahmaputra. The name "Tsangpo" is derived from the Tibetan language, meaning "purifier."
2. **Entry into India**: When the river enters India, it is known by two names: Siang and Dihang. The Siang is the main tributary of the Brahmaputra in Arunachal Pradesh, while the Dihang is another name for the same river as it flows through the state. The river changes its name to Brahmaputra as it moves further west into Assam.
3. **In Bangladesh**: In Bangladesh, the Brahmaputra is known as the Jamuna. The river merges with the Padma (the main channel of the Ganges) and the Meghna to form the world's largest delta, the Sundarbans. The name "Jamuna" is derived from the Sanskrit word "Yamuna," which is the name of another major river in India.
The river's course and the names it is known by reflect the diverse cultural and geographical influences it encounters. The Brahmaputra is not only a geographical feature but also a significant cultural and economic resource for the regions it flows through. Understanding the river's names and its course is crucial for comprehending the geography and the socio-economic dynamics of the region.
In conclusion, all three statements about the Brahmaputra are correct, making option D the correct answer. The river is known as Tsangpo in Tibet, Siang or Dihang when it enters India, and Jamuna in Bangladesh. This comprehensive understanding of the river's names and course is essential for students of geography, particularly those studying the region of Assam and the broader context of the Brahmaputra River system.