Shahjehan Begum of Bhopal, a significant 19\textsuperscript{th}-century female ruler, was instrumental in the conservation and revitalization of the Sanchi Stupa. Her financial support for excavations and preservation initiatives safeguarded this vital Buddhist monument.
Conversely, the Reason statement accurately states that the Sanchi Stupa exemplifies early Buddhist architecture, originating from the Mauryan period, specifically Emperor Ashoka's rule.
Nonetheless, the provided reason (R) fails to logically substantiate the assertion (A); it does not elucidate Shahjehan Begum's motivation for contributing to Sanchi's preservation. Consequently, although both statements A and R are factually correct, R does not offer a valid explanation for A.