The correct option is B Stupas
Ashoka’s reign saw another notable stone architecture, the Stupa. Stupas are domes, under which relics pertaining to Lord Buddha or other Buddhist monks are preserved. Ashoka had many Stupas built during his rule. The Stupas at Sarnath, Berat, Nandangadh, Devanimori and Sanchi are the most famous ones. Other notable architectural monuments of the Mauryan age are Chaityas, Viharas and Maths. The Stupa at Sanchi is famous throughout the world. It is situated in Madhya Pradesh.