The correct answer is (b), Gangotri.
The Gangotri glacier is the largest glacier in the Garhwal Himalayas. It is located in the Chamoli district of Uttarakhand, India. The glacier is fed by several tributaries, including the Rakta-varna, Shwetavarna, Nilambar, Pilapani and Chaturangi glaciers. The Gangotri glacier is a major source of water for the Ganges River.
The Bhagirathi Kharak glacier is a tributary of the Gangotri glacier. It is located in the Chamoli district of Uttarakhand, India. The Bhagirathi Kharak glacier is a smaller glacier than the Gangotri glacier. It is not a major source of water for the Ganges River.
The Satopanth glacier is a tributary of the Alaknanda River. It is located in the Chamoli district of Uttarakhand, India. The Satopanth glacier is a smaller glacier than the Gangotri glacier. It is not a major source of water for the Ganges River.
The Milam glacier is a tributary of the Kali River. It is located in the Pithoragarh district of Uttarakhand, India. The Milam glacier is a smaller glacier than the Gangotri glacier. It is not a major source of water for the Ganges River.