The correct answer is (b). Roopkund is a glacial lake located in the Garhwal Himalayas in the Indian state of Uttarakhand. It is known for the hundreds of human skeletons that have been found on its shores. The skeletons are believed to be those of a group of people who were killed in a snowstorm around 850 AD.
Dodital is a high-altitude lake located in the Garhwal Himalayas in the Indian state of Uttarakhand. It is a popular tourist destination and is known for its scenic beauty.
Hemkund Sahib is a glacial lake located in the Garhwal Himalayas in the Indian state of Uttarakhand. It is a sacred lake for Sikhs and is one of the most popular pilgrimage sites in the region.
Naukuchiya Tal is a lake located in the Kumaon Himalayas in the Indian state of Uttarakhand. It is a popular tourist destination and is known for its scenic beauty.
The skeletons found in Roopkund are believed to be those of a group of people who were killed in a snowstorm around 850 AD. The skeletons are well-preserved and show no signs of violence. The cause of death is believed to be hypothermia. The skeletons are a mystery and there is no definitive answer as to who they were or why they were at Roopkund.