Correct option is (d) All of these.
Sanchi stupa was built in 3rd century BCE, by Mauryans, near the city of Bhopal, and is believed to house ashes of the Buddha. The rulers of Bhopal, Shahjehan Begum and her successor Sultan Jehan Begum, provided money for the preservation of the ancient site. One of the most important Buddhist centres, the discovery of Sanchi has vastly transformed our understanding of early Buddhism.