The correct answer is: A. Kullu
Prashar Lake is a glacial lake located in the Kullu district of Himachal Pradesh, India. It is situated at an altitude of 2,900 meters (9,500 feet) above sea level, and is surrounded by snow-capped mountains. The lake is a popular tourist destination, and is known for its scenic beauty.
Option B, Sirmaur, is incorrect because Prashar Lake is not located in the Sirmaur district. Sirmaur is a district in the Indian state of Himachal Pradesh. It is located in the southeastern part of the state, and is bordered by the districts of Solan, Shimla, Mandi, Bilaspur, and Hamirpur. The district has a population of over 600,000 people, and its headquarters is the town of Nahan.
Option C, Shimla, is incorrect because Prashar Lake is not located in the Shimla district. Shimla is the capital of the Indian state of Himachal Pradesh. It is located in the northern part of the state, and is bordered by the districts of Kullu, Mandi, Bilaspur, and Solan. The city has a population of over 200,000 people, and is a popular tourist destination.
Option D, Mandi, is incorrect because Prashar Lake is not located in the Mandi district. Mandi is a district in the Indian state of Himachal Pradesh. It is located in the central part of the state, and is bordered by the districts of Kullu, Shimla, Bilaspur, Hamirpur, and Una. The district has a population of over 1 million people, and its headquarters is the town of Mandi.