The correct answer is A. Chamba.
Manimahesh Lake is a high-altitude lake located in the Chamba district of Himachal Pradesh, India. It is a sacred lake for Hindus and is considered to be one of the most beautiful lakes in the Himalayas. The lake is situated at an altitude of 4,270 meters (14,010 feet) and is surrounded by snow-capped peaks. The lake is fed by several glaciers and streams, and its waters are crystal clear. Manimahesh Lake is a popular tourist destination and is a great place for trekking, camping, and fishing.
Option B, Shimla, is the capital of Himachal Pradesh. It is a popular tourist destination and is known for its colonial architecture and scenic views. However, Manimahesh Lake is not located in Shimla.
Option C, Lahaul Spiti, is a district in Himachal Pradesh. It is a remote and sparsely populated district that is known for its high-altitude mountains and glaciers. However, Manimahesh Lake is not located in Lahaul Spiti.
Option D, Bilaspur, is a district in Himachal Pradesh. It is a relatively low-altitude district that is known for its temples and historical sites. However, Manimahesh Lake is not located in Bilaspur.