(a) The Mahadeo hills are a range of sandstone hills located in Central India. Hence, option (a) is correct. These hills are located in the Northern part of Satpura range. Hence, option (a) is the correct answer. The cave shelters found in the Mahadeo hills contains some of the earliest evidence of rock paintings in India. Dhupgarh is the highest point in the Mahadeo hills with a height of 1352 meters.