Answer : 4. "Madhya Pradesh"
Explanation :

1. Bhimbetka is a Palaeolithic residential site located in Raisen district of Madhya Pradesh.

2. It is a UNESCO World Heritage Site consisting of seven hills and more than 750 rock shelters distributed over 10 km.

3. Bhimbetka rock shelters are the oldest signs of human life in India. They provide important information about the life, culture and art of early man.

4. Bhimbetka was discovered by Dr. Vishnu Sridhar Wakankar in 1957. It was declared a site of national importance by the Archaeological Survey of India, Bhopal Division in 1990.