The correct answer is C. Yunam-so lake.
Yunam-so lake is a lake located in the Mandi district of Himachal Pradesh, India. It is known for its floating island, which is a large mass of vegetation that is anchored to the bottom of the lake. The island is home to a variety of plants and animals, and it is a popular tourist destination.
Pong Lake is a reservoir located in the Mandi district of Himachal Pradesh, India. It is formed by the Pong Dam, which was built on the Beas River in 1960. The lake is a popular tourist destination, and it is also used for irrigation and hydroelectric power generation.
Rewalsar Lake is a lake located in the Mandi district of Himachal Pradesh, India. It is a sacred lake for both Hindus and Buddhists, and it is said to be the birthplace of Guru Padmasambhava. The lake is a popular tourist destination, and it is also used for irrigation and hydroelectric power generation.
Parvati Lake is a lake located in the Kullu district of Himachal Pradesh, India. It is a popular tourist destination, and it is also used for irrigation and hydroelectric power generation.