The Ghagra, the Gandak and the Kosi rivers are tributaries of the river _______.
A) Indus
B) Yamuna
C) Ganga
D) Brahmaputra

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Rivers of India play a significant position in the lives of the common Indian people. The river systems provide potable water, inexpensive transportation, electricity, as well as lend livelihoods for a huge portion of the community all over the country.

Complete answer:
Ghagra is also named as Karnali river. It is a perennial transboundary river origin from Tibetan plateau from Lake Mansarovar slashing through the Himalayas in Nepal. It has an extent of 507 kilometres and is the biggest tributary of Ganges. It has a tributary Choti Gandak which is an abandoned meandering river forming from near Dhesopool, Maharajganj district of UP. Primarily regulated by rainfall and maximum of its basin is utilized for irrigation and damming motives.
The Kosi river pits from the northern slopes of Himalayas in Tibet and southern slopes in Nepal. Carrying a distance of 729 kilometres, Kosi has an alluvial fan which is the biggest in the world.
Also subsisting named for the "sorrow of Bihar" with annual flooding for 21,000 km sq. Sagarmatha national park and Koshi Tappu Wildlife Reserve are also found on this river.
The Gandak River Basin is originated between $26^\circ 00'$ to $27^\circ 20'{\text{N}}$ of latitude and $83^\circ 30'$ to $84^\circ 15'{\text{E}}$ of longitude.
The Gandaki River is one of the crucial streams of Nepal and a left-bank affluent of the Ganges in India. It fabricates between the identical Kosi system to the east and the Karnali network to the west. Triveni Temple is found across the Gandak Barrage in Nepal, nearly 3 km from the Gandak Barrage. Budhi Gandak is a crucial tributary of Koshi in India.

Thus, option (C) is correct.

The Ganga River is a religious water body to Hindus that commences tall in the Himalaya Mountains and empties into the Bay of Bengal area. The enclosing river basin has a community of approximately more than four hundred million people.