The correct answer is: A. a-1, b-2, c-3, d-4.
The Kosi River originates in the Himalayas, in the Mahabharat range. The Gandak River originates in the Himalayas, in the Someshwar range. The Bagmati River originates in the Himalayas, in Mount Gosainthan. The Burhi Gandak River originates in the Himalayas, in the Managmot range.
The Mahabharat range is a mountain range in the Himalayas. It is located in the Indian states of Uttarakhand and Uttar Pradesh. The Someshwar range is a mountain range in the Himalayas. It is located in the Indian state of Uttarakhand. Mount Gosainthan is a mountain in the Himalayas. It is located in the Nepal-China border. The Managmot range is a mountain range in the Himalayas. It is located in the Indian state of Uttarakhand.