The correct answer is: D. Kangra
Kangra was called as Nagarkot in ancient period in Himachal Pradesh.
Chamba, Bilaspur, and Kullu are also states in Himachal Pradesh, but they were not called as Nagarkot in ancient period.
Kangra is a district in the Indian state of Himachal Pradesh. It is the largest district in the state, both in terms of area and population. The district is named after its headquarters, Kangra town.
Kangra is a historical and cultural district. It was the capital of the Kangra Kingdom, which was one of the most powerful kingdoms in the region. The district is home to many historical monuments, including the Kangra Fort, which is one of the largest forts in India.
Kangra is also a popular tourist destination. The district is home to many beautiful temples, including the Baijnath Temple, which is one of the most important temples in the state. The district is also home to many natural attractions, including the Dhauladhar Range, which is a popular destination for trekking and mountaineering.