Correct Option
The Brahmaputra River, known as Tsangpo in Tibet, enters India through Arunachal Pradesh. It is joined by several tributaries, both from its left and right banks, before flowing into Bangladesh.
- Dibang River: This is a significant left-bank tributary that originates in the Mishmi Hills and joins the Brahmaputra near Sadiya, close to the Assam-Arunachal Pradesh border.
- Kameng River: Also known as Jia Bhoreli in Assam, it is a prominent right-bank tributary. It originates in the Tawang district of Arunachal Pradesh and merges with the Brahmaputra in Sonitpur district, Assam.
- Lohit River: A major left-bank tributary, it originates in eastern Tibet and flows through Arunachal Pradesh before its confluence with the Brahmaputra near Sadiya, Assam.
All three rivers – Dibang, Kameng, and Lohit – are established tributaries of the Brahmaputra.
Incorrect Options
Options 1, 2, and 3 are incorrect because they exclude one or more of the listed rivers (Dibang, Kameng, Lohit), all of which are tributaries of the Brahmaputra. Option (d) is the only choice that correctly identifies all three as tributaries.