The correct answer is: C. Mandi
The Pir Panjal mountain range is a mountain range in the Himalayas that runs from the Indian state of Jammu and Kashmir to the Indian state of Himachal Pradesh. The range is part of the Great Himalayan Ranges and is the main watershed between the Indus and the Ganges river basins. The Pir Panjal range is a popular destination for trekking, mountaineering, and other outdoor activities.
The Pir Panjal mountain range is mainly related to the district of Mandi in Himachal Pradesh. The range runs through the district from north to south and forms the eastern boundary of the district. The Pir Panjal range is a major source of water for the district and its rivers, including the Beas, Ravi, and Sutlej, are all fed by the range. The Pir Panjal range is also a major source of timber for the district.
The other options are incorrect because they are not districts in Himachal Pradesh that are related to the Pir Panjal mountain range. Shimla is the capital of Himachal Pradesh, Bilaspur is a district in Himachal Pradesh that is located to the south of Mandi, and Chamba is a district in Himachal Pradesh that is located to the north of Mandi.