The correct option is C Sanchi
The Stupas of Sanchi were constructed on the orders of Emperor Ashoka to preserve and spread the Buddhist philosophy. This stupa was originally a low structure of brick, half the diameter of the present edifice hemispherical in shape with raised terraces at the base. It was enclosed by a wooden railing and a stone umbrella at the top. This Great Stupa served as a nucleus to the large Buddhist establishment during the later period.