The correct answer is option A. Rupin valley is situated in the Kullu district of Himachal Pradesh. It is a beautiful valley with snow-capped mountains, lush green forests, and crystal clear rivers. The valley is a popular tourist destination and is known for its trekking trails, camping sites, and wildlife sanctuaries.
Option B is incorrect because Kinnaur is a district in Himachal Pradesh that is located to the north of Kullu. The district is known for its high altitude mountains, glaciers, and snow-capped peaks.
Option C is incorrect because Mandi is a district in Himachal Pradesh that is located to the south of Kullu. The district is known for its temples, palaces, and forts.
Option D is incorrect because Chamba is a district in Himachal Pradesh that is located to the east of Kullu. The district is known for its temples, monasteries, and wildlife sanctuaries.