Major River Systems

 **Barak:** The Barak River is important in Manipur and Mizoram, but it does not flow through Arunachal Pradesh. **Lohit:** The Lohit River originates in the eastern end of the Himalayas in the Mishmi Hills of Arunachal Pradesh and flows through the districts of Anjaw, Lohit, and Dibrugarh in Arunachal Pradesh. **Subansiri:** The Subansiri River is a tributary of the Brahmaputra River and flows through Arunachal Pradesh. Therefore, only the Lohit and Subansiri rivers flow through Arunachal Pradesh. Option (B) 2 and 3 only

 All the three are tributaries of the Brahmaputra. Manas, Dibang, Kameng and Lohit are the key tributaries of the river Brahmaputra.

**Statement 1 is Incorrect:** The Teesta River originates from the Pahunri (or Teesta Kangse) glacier and flows southward through the Sikkim Himalaya. where the Rangpo River joins, and where it forms the border between Sikkim and West Bengal up to Teesta Bazaar.  **Statement 2 is correct:** Just before the Teesta Bridge, where the roads from Kalimpong and Darjeeling join, the river is met by its main tributary, the Rangeet River. Hence Statement 2 is correct. **Statement 3 is Incorrect:** It changes course southwards, flowing into West Bengal. The river then merges up with the Brahmaputra River after it bifurcates the city of Jalpaiguri and flows just touching Cooch Behar district at Mekhliganj and moves to Fulchori in Bangladesh. Thus it does not flow directly into the Bay of Bengal. Hence statement 3 is not correct. Hence, option B is the correct answer.

**Option A is incorrect.** The Chenab joins Satluj in Pakistan. **Option B is incorrect.** The Jhelum joins the Chenab near Jhang in Pakistan. **Option C is incorrect.** The Ravi joins the Chenab near Sarai Sidhu. **Option D is correct.** Satluj is joined by the Chenab in Pakistan. Thus, Satluj receives the collective drainage of the Ravi, Chenab and Jhelum rivers. It joins the Indus a few kilometres above Mithankot. 

* **Gomati**: The Gomti River originates in the Central Himalayas and joins the Ganga near Varanasi, Uttar Pradesh. * **Ghaghara**: The Ghaghara River, also known as the Ghagra-Rapti River, is the largest tributary of the Ganga. It originates in the Nepal Himalayas and joins the Ganga near Chhapra, Bihar.  * **Gandak**: The Gandak River originates in the Nepal Himalayas and joins the Ganga near Patna, Bihar. * **Kosi**: The Kosi River, also known as the Koshi River, is known for its erratic behaviour and floods. It originates in the Nepal Himalayas and joins the Ganga near Katihar, Bihar. **Therefore, the correct sequence is Gomati - Ghaghara - Gandak - Kosi.**