The correct answer is: C. Bilaspur
Sui fair is a traditional fair held in Bilaspur district of Himachal Pradesh. It is held every year in the month of April to celebrate the harvest season. The fair is a major tourist attraction and features a variety of cultural activities, including folk dances, music, and traditional games.
Option A: Kangra is a district in Himachal Pradesh. It is the largest district in the state and is home to a number of historical and cultural sites, including the Kangra Fort and the Kangra Valley Railway.
Option B: Una is a district in Himachal Pradesh. It is located in the southern part of the state and is known for its scenic beauty and its production of apples.
Option C: Bilaspur is a district in Himachal Pradesh. It is located in the central part of the state and is home to a number of historical and cultural sites, including the Bilaspur Fort and the Sui fair.
Option D: Chamba is a district in Himachal Pradesh. It is located in the northern part of the state and is known for its scenic beauty and its production of apples.