The Aravalli range is the oldest ___________ geological feature anywhere in the world. These were once tall mountains, possibly as high as the Himalayas. Over hundreds of millions of years these tall mountains have been___________ to low hills and ridges. Yet, these diminutive hills have been ___________ to many important events in Indian $$history^{7}$$

A

existing, reduced, sentinel

B

prevailing, destroyed, testament

C

surviving, eroded, witness

D

continuing, broken down, observers