The correct answer is D. All of these.
The Saraswati River is a mythical river in Hinduism. It is mentioned in the Rigveda, the oldest Hindu scripture, and is said to have been a major river in ancient India. However, there is no physical evidence of the Saraswati River, and it is now believed to have dried up thousands of years ago.
The Tangri, Vedihi, and Markanda are all rivers that are said to be tributaries of the Saraswati River. However, there is no evidence that these rivers were ever connected to the Saraswati River, and it is now believed that they are all independent rivers.
The Saraswati River is a popular pilgrimage destination for Hindus. Many Hindus believe that the Saraswati River is a sacred river, and that bathing in its waters can cleanse one of sin. The Saraswati River is also a popular tourist destination, and many people visit the river to see its beautiful scenery.