The correct answer is A) Narmada and Chambal.
The Narmada and Chambal river valleys are rich in Paleolithic sites. The Narmada valley is home to the Bhimbhetka rock shelters, which contain some of the oldest known rock art in India. The Chambal valley is home to the Adamgarh rock shelters, which contain evidence of human habitation from the Paleolithic period to the Iron Age.
The Tapti and Godavari river valleys are also home to some Paleolithic sites, but they are not as rich in Paleolithic sites as the Narmada and Chambal river valleys. The Mahi and Betwa river valleys are not known for their Paleolithic sites.
The Ganga and Yamuna river valleys are located in northern India, and they are not known for their Paleolithic sites. The Paleolithic period is the earliest period of human history, and it is characterized by the use of stone tools. The Paleolithic period lasted from about 2.5 million years ago to about 10,000 years ago.
The Bhimbhetka rock shelters are located in the Narmada valley in Madhya Pradesh, India. The rock shelters contain some of the oldest known rock art in India. The rock art dates back to the Paleolithic period, and it depicts animals, humans, and hunting scenes.
The Adamgarh rock shelters are located in the Chambal valley in Madhya Pradesh, India. The rock shelters contain evidence of human habitation from the Paleolithic period to the Iron Age. The Paleolithic artifacts found at the rock shelters include stone tools, animal bones, and human remains.