The correct answer is: B. Chandra Nahan glacier
The Chandra Nahan glacier is a glacier located in the Garhwal Himalayas in the Indian state of Uttarakhand. It is the largest glacier in the Garhwal Himalayas and is the source of the Pabbar River. The glacier is about 25 kilometers long and has a surface area of about 100 square kilometers. The Chandra Nahan glacier is a popular destination for trekking and mountaineering.
The other options are incorrect because they are not glaciers that feed the Pabbar River. The Chandra glacier is located in the Zanskar Range in the Indian state of Jammu and Kashmir. The Bhadal glacier is located in the Pir Panjal Range in the Indian state of Himachal Pradesh. The Bhaga glacier is located in the Dhauladhar Range in the Indian state of Himachal Pradesh.
The Pabbar River is a river in the Indian state of Uttarakhand. It is a tributary of the Yamuna River. The Pabbar River is about 200 kilometers long and has a drainage basin of about 5,000 square kilometers. The Pabbar River is a popular destination for fishing and rafting.