The correct option is A Delhi
The
iron pillar at Mehrauli, Delhi, is a remarkable example of the skill of
Indian crafts persons. It is made of iron, 7.2 m high and weighs over 3
tonnes. It was made about 1500 years ago. It has a inscription which mentions the term "chandra". Therefore, there is a dispute ether it belongs to the Mauryan king Chandragupta or the Gupta king Chandragupta II.