Shahjehan Begum of Bhopal was a prominent female ruler in the 19\textsuperscript{th} century who played a key role in the preservation and restoration of the Sanchi Stupa. Her contributions, including funding excavations and conservation efforts, helped protect this important Buddhist monument.
On the other hand, the Reason statement correctly identifies that the Sanchi Stupa is a classical example of early Buddhist architecture—it dates back to the Mauryan period, particularly Emperor Ashoka’s reign.
However, the reason given (R) does not logically explain the assertion (A)—that is, it doesn’t explain why Shahjehan Begum contributed to the preservation of Sanchi. Therefore, while both A and R are true, R is not the correct explanation of A.