The correct answer is D. All of these.
The Kosi River is a major river in northern India and eastern Nepal. It is the fifth-largest river in India by discharge. The river originates in the Himalayas and flows through the Indian states of Uttarakhand, Uttar Pradesh, Bihar, and Jharkhand, and the Nepali districts of Sunsari, Morang, Saptari, and Siraha. It joins the Ganges River near Bhagalpur in Bihar.
The Kosi River is an important source of irrigation and drinking water for millions of people in India and Nepal. However, the river is also prone to flooding, which has caused widespread damage and displacement in the past.
The Kosi River is an important river in the districts of Supaul, Madhepura, and Saharsa in Bihar. The river provides irrigation for the agricultural land in these districts and is also a source of drinking water for the people living in these districts. The river is also a major transportation route for the people living in these districts.
The Kosi River is a beautiful river and is a popular tourist destination. The river is home to a variety of wildlife, including fish, birds, and mammals. The river is also a popular spot for fishing and boating.