Correct Answer:

Solution : The correct answer is Karst.

Sinkholes are depressions in the earth caused by the collapse of layers of the Earth's surface into caverns. It appears like a circular or funnel-shaped opening at the top and at the bottom. It is a characteristic feature of Karst topography along with Pillar, Stalacites and Stalagmites. It is caused by limestone or chalk region erosion. 

Additional information-

Karst topography can be found in India in the Vindhya area, the Himalayas, Pachmarhi in Madhya Pradesh, the surrounding coast around Vishakhapatnam, and Bastar in Chhattisgarh.