The correct answer is A. Lahaul and Spiti.
Pin Valley National Park is a national park in the Lahaul and Spiti district of Himachal Pradesh, India. It is located in the western Himalayas, at an altitude of 3,000 to 6,000 meters (9,800 to 19,700 feet). The park was established in 1981 to protect the unique flora and fauna of the region.
The park is home to a variety of animals, including snow leopards, Himalayan tahr, ibex, and blue sheep. It is also home to a variety of birds, including the Himalayan snowcock, the lammergeier, and the bearded vulture.
The park is a popular destination for trekking, mountaineering, and wildlife photography.
Option B, Kinnaur, is incorrect because Pin Valley National Park is not located in the Kinnaur district.
Option C, Mandi, is incorrect because Pin Valley National Park is not located in the Mandi district.
Option D, Solan, is incorrect because Pin Valley National Park is not located in the Solan district.