The correct answer is: A. Saraswati
The Saraswati river is a major river mentioned in the Rigveda, one of the four sacred texts of Hinduism. It is said to have been a mighty river that flowed through the Punjab region of India, but it is now dry. The Chautang river is a tributary of the Yamuna river, and it is believed to be the modern-day remnant of the Saraswati river.
The Saraswati river is mentioned in many hymns of the Rigveda, and it is often associated with the goddess Saraswati, who is the goddess of knowledge, learning, and speech. The river is also mentioned in the Mahabharata and the Ramayana, two of the most important epics of Hinduism.
The Saraswati river is believed to have dried up due to a combination of factors, including climate change and human activity. However, the river is still an important part of Hindu culture, and it is often mentioned in prayers and rituals.
The other options are incorrect because they are not rivers that are mentioned in the Rigveda.
- Shatradi is a river that is mentioned in the Mahabharata.
- Krabhu is a river that is mentioned in the Ramayana.
- Drishadvati is a river that is mentioned in the Rigveda, but it is not the same river as the Chautang river.