The Gandak river is a tributary of which river?

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Accepted Answer

Step-by-step explanation:

1. The Gandak (also called Gandaki or Narayani) originates in Nepal and flows south into the Indian state of Bihar.
2. It meets a major river in Bihar; historically and geographically, the Gandak joins the Ganga (Ganges) river system.
3. Among the given options, Ganga river is option $(2)$, which corresponds to choice "b".

Therefore, the Gandak is a tributary of the Ganga river.

FINAL_ANSWER: b

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