The correct answer is (d) Gangotri.
The Gangotri Glacier is the largest glacier in the Garhwal Himalayas, in the Indian state of Uttarakhand. It is the source of the Ganges River, one of the most important rivers in India. The glacier is about 30 kilometers long and 2 kilometers wide. It is a popular destination for trekking and mountaineering.
The Milam Glacier is the second longest glacier in Uttarakhand. It is located in the Kumaon Himalayas, in the Chamoli district. The glacier is about 25 kilometers long and 1 kilometer wide. It is a popular destination for trekking and mountaineering.
The Satopanth Glacier is the third longest glacier in Uttarakhand. It is located in the Garhwal Himalayas, in the Chamoli district. The glacier is about 20 kilometers long and 1.5 kilometers wide. It is a popular destination for trekking and mountaineering.
The Pindari Glacier is the fourth longest glacier in Uttarakhand. It is located in the Kumaon Himalayas, in the Pithoragarh district. The glacier is about 15 kilometers long and 1 kilometer wide. It is a popular destination for trekking and mountaineering.