The correct answer is Teesta.

• ​​The Teesta River originates from the Pahunri (or Teesta Kangse) glacier and flows southward through gorges and rapids in the Sikkim Himalaya.
• The river then goes merging 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.
• Teesta river ultimately drains into the Brahmaputra at Teestamukh Ghat in Kamarjani- Bahadurabad in the Rangpur district of Bangladesh. 
• The Teesta Basin in India extends over an area of 9,855 sq. km, which is nearly 0.28% of the total geographical area of the country.
• The basin lies in the states of Sikkim and West Bengal. 
• Hence it is a minor river basin in India as its catchment area is less than 2,000 sq. km.
• Teesta is a major river basin of Bangladesh.

• On the basis of the size of the watershed, the drainage basins of India are grouped into three categories:
  • Major river basins
    • ​With more than 20,000 sq. km of the catchment area.
    • It includes 14 drainage basins such as
      • The Ganga,
      • The Brahmaputra,
      • The Krishna,
      • The Tapi,
      • The Narmada,
      • The Mahi,
      • The Pennar,
      • The Sabarmati, the Barak, etc. 
  • Medium river basins
    • With a catchment area between 2,000-20,000 sq. km.
    • Incorporating 44 river basins such as the Kalindi, the Periyar, the Meghna, etc.
  •  Minor river basins
    • With a catchment area of less than 2,000 sq. km
    • Include a good number of rivers flowing in the area of low rainfall.