The correct answer is option C. Una.
Mehatpur is a town and a nagar panchayat in Una district in the Indian state of Himachal Pradesh. It is located on the banks of the Beas River, about 100 kilometers from the state capital, Shimla. The town is known for its industrial activity, particularly in the textile and paper industries.
The other options are incorrect. Lahaul and Spiti is a district in the Indian state of Himachal Pradesh. It is the most remote and sparsely populated district in the state. Kullu is a district in the Indian state of Himachal Pradesh. It is known for its scenic beauty and is a popular tourist destination. Mandi is a district in the Indian state of Himachal Pradesh. It is the second largest district in the state and is known for its historical and cultural heritage.