The correct answer is: The North Koel.
The North Koel is a river in the Indian state of Jharkhand. It originates from the Chorha Pahari hills in the Palamu district and flows through the districts of Garhwa, Chatra, and Latehar before joining the Son River in the Deoghar district. The North Koel is a major tributary of the Son River and is an important source of irrigation and drinking water for the people of Jharkhand.
The South Koel is another river in Jharkhand that originates from the Chorha Pahari hills. However, it flows in a different direction than the North Koel and joins the Damodar River in the Ranchi district. The South Koel is not as important as the North Koel for irrigation and drinking water, but it is still a significant river in Jharkhand.
The Punpun is a river in Bihar that originates from the Kaimur Range. It flows through the districts of Rohtas, Aurangabad, and Patna before joining the Ganges River in the Patna district. The Punpun is not as important as the North Koel or the South Koel, but it is still a significant river in Bihar.
The Karo is a river in Jharkhand that originates from the Rajmahal Hills. It flows through the districts of Sahebganj and Godda before joining the Ganges River in the Sahibganj district. The Karo is not as important as the North Koel, the South Koel, or the Punpun, but it is still a significant river in Jharkhand.