Correct Answer: Barabar and Nagarjuni Caves

Solution : The correct answer is Barabar and Nagarjuni Caves.

Barabar and Nagarjuni caves are considered the oldest surviving rock-cut caves in India. These rock-cut caves date back to the 3rd century BC, the Mauryan period. Also, these rock-cut caves are regarded as the place of origin of the Ajivika sect. Most of these are found in Bihar.