The elevation of Udayagiri hill is

100 m
150 m
231 m
504 m

The correct answer is C. 231 m.

Udayagiri hill is a hill located in the city of Visakhapatnam, Andhra Pradesh, India. It is a popular tourist destination, known for its Buddhist caves and temples. The hill is 231 meters (758 feet) above sea level.

Option A is incorrect because the elevation of Udayagiri hill is 231 meters, not 100 meters.

Option B is incorrect because the elevation of Udayagiri hill is 231 meters, not 150 meters.

Option D is incorrect because the elevation of Udayagiri hill is 231 meters, not 504 meters.