Which among the following is/are a high altitude lake?

A high-altitude lake is simply a lake that is located very, very high up in the mountains, often where it's cold and snowy.

Let's look at our options:

1. Prashar Lake: This beautiful lake is in the Mandi district of Himachal Pradesh. It's famous for its floating island! It's located at an altitude of about 2,730 meters (which is quite high!). So, yes, it's a high-altitude lake.

2. Nako Lake: This serene lake is found in the Kinnaur district. It's a very sacred place and often freezes over in winter due to its high elevation. It sits at an impressive altitude of about 3,662 meters. Definitely a high-altitude lake!

3. Suraj Tal Lake: Located in the Lahaul and Spiti district, this lake is one of the highest lakes in India! It's the source of the Bhaga River. Its altitude is a stunning 4,890 meters. Absolutely a high-altitude lake!

Since Prashar lake, Nako lake, and Suraj Tal lake are all found at significantly high elevations in the mountains of Himachal Pradesh, they are all considered high-altitude lakes.

Therefore, the correct answer is Option D: All of the above.