Which one of the following states is part of the Ganga Basin ?

Which one of the following states is part of the Ganga Basin ?

Himachal Pradesh
Sikkim
Assam
Odisha
This question was previously asked in
UPSC CISF-AC-EXE – 2023
Himachal Pradesh is part of the Ganga Basin.
The Ganga basin is the largest river basin in India, draining areas in several states of North and East India, as well as parts of Nepal and Bangladesh.
While Himachal Pradesh is known for rivers of the Indus system (Sutlej, Ravi, Beas), its southern slopes drain into the Yamuna River, which is a major tributary of the Ganga. Therefore, parts of Himachal Pradesh fall within the Ganga basin (specifically the Yamuna sub-basin). Sikkim is part of the Brahmaputra basin. Assam is primarily in the Brahmaputra basin. Odisha is drained by rivers like Mahanadi, Brahmani, Baitarani, etc., and is not part of the Ganga basin.