The correct answer is Brahmaputra.Brahmaputra river is also known as the Yarlung Tsangpo in the Tibet region of China.The Yarlung Tsangpo River is the longest river in the Tibet Region, China.Downstream from Arunachal Pradesh, the river becomes wider and after reaching Assam, the river is known as the Brahmaputra.The river is called the Everest of Rivers because of its extreme conditions.It is also called the Dihang River in Arunachal Pradesh.It originates from the Manasarovar Lake region, near Mount Kailash.It flows southwest through the Assam Valley as the Brahmaputra and south through Bangladesh as the Jamuna.It merges with the Ganges, popularly known as the Padma in Bangladesh, becomes the Meghna, and ultimately empties into the Bay of Bengal.Additional InformationIndus:?The Indus originates from the Bokhar Chu (glacier) on the northern slopes of Mt. Kailash.Jhelum, Chenab, Ravi, Beas, and Satluj are its main tributaries.The River passes by the Nanga-Parvat and turns southwest to enter Pakistan.Sutlej:?Sutlej originates from Rakshastal Lake.Rakshastal Lake is located near Lake Manasarovar and Mount Kailash.Sutlej River is also known as Shatadru (Ancient name).River Sutlej is one of the major tributaries of Indus.Teesta:?Teesta River originates from the Pahunri (or Teesta Kangse) glacier in Sikkim.It is a tributary of the Brahmaputra.It flows through Sikkim and West Bengal through Bangladesh and enters the Bay of Bengal.