The correct answer is: A. Lahaul and Spiti
The Ashokan stupa is located in the village of Kalpa in the Lahaul and Spiti district of Himachal Pradesh. It is one of the most important Buddhist sites in the state. The stupa was built by Emperor Ashoka in the 3rd century BC. It is a large, circular structure with a dome-shaped roof. The stupa is made of stone and is decorated with Buddhist symbols. It is a popular tourist destination and is a UNESCO World Heritage Site.
The other options are incorrect because:
- Option B, Kullu valley, is a valley in the state of Himachal Pradesh. It is a popular tourist destination known for its beautiful scenery and its many temples and monasteries. However, there is no Ashokan stupa located in the Kullu valley.
- Option C, Kufri, is a hill station in the state of Himachal Pradesh. It is a popular tourist destination known for its cool climate and its many scenic views. However, there is no Ashokan stupa located in Kufri.
- Option D, Both (A) and (B), is incorrect because only option A is correct.