The correct answer is: d) All of the above.
The Brahmaputra River is known by different names in different parts of its journey. In Arunachal Pradesh, it is known as the Siang and Dihang. In Assam, it is known as the Brahmaputra. In Bangladesh, it is known as the Jamuna.
The Siang is the upper course of the Brahmaputra River. It originates in the Himalayas in Tibet and flows through Arunachal Pradesh. The Dihang is a tributary of the Siang. It originates in the Himalayas in Arunachal Pradesh and flows into the Siang near Pasighat.
The Brahmaputra is the main course of the river. It flows through Assam and Bangladesh. The Jamuna is a tributary of the Brahmaputra. It originates in the Himalayas in Tibet and flows into the Brahmaputra near Goalpara in Assam.
The Brahmaputra is one of the largest rivers in the world. It is 2,900 kilometers long and has a drainage basin of 580,000 square kilometers. The Brahmaputra is a major source of water for irrigation, drinking water, and hydroelectric power. It is also a major transportation route.