The correct answer is (a) Subansiri.
The Subansiri is a major river in India that originates in the glaciers of Arunachal Pradesh. It is the largest tributary of the Brahmaputra River. The Subansiri River is about 1,500 kilometers long and flows through the states of Arunachal Pradesh, Assam, and Nagaland. The river is a major source of water for irrigation and hydroelectric power.
The Manas River is a river in India that originates in the Himalayas. It is a tributary of the Brahmaputra River. The Manas River is about 500 kilometers long and flows through the states of Assam and Bhutan. The river is a major source of water for irrigation and hydroelectric power.
The Teesta River is a river in India and Bangladesh. It originates in the Himalayas and flows through the states of Sikkim, West Bengal, and Bangladesh. The Teesta River is about 300 kilometers long and is a major source of water for irrigation and hydroelectric power.
The Ganga River is a river in India and Bangladesh. It is the longest river in India and the third longest river in Asia. The Ganga River originates in the Himalayas and flows through the states of Uttarakhand, Uttar Pradesh, Bihar, Jharkhand, and West Bengal. The river is a major source of water for irrigation, drinking water, and hydroelectric power.