Correct Answer: Ganga and Son

Solution : The correct answer is Ganga and Son .

Magadha was an ancient Mahajanapada (a term referring to ancient territorial divisions in India) located in the eastern part of the Indian subcontinent. The rivers that surrounded Magadha included:

Ganges (Ganga): The Ganges River flowed along the western and southern boundaries of Magadha. It is one of the most sacred and significant rivers in India and has played a central role in the region's culture and history.

Son River: The Son River, a tributary of the Ganges, bordered the northern part of Magadha.