The correct option is A Aravalli's
The Aravalli range are the oldest fold mountains in India. The northern end of range continues as isolated hills and rocky ridges into Haryana state, ending in Delhi. The famous Delhi Ridge is the last leg of the Aravalli Range, which traverses through South Delhi and terminates into Central Delhi
where Raisina hill is its last extension. It is one of the world's oldest mountain ranges.