The correct options are
B <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
The Ashoka Pillars
C <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
Sanchi Stupa
Carving out stone sculptures of larger size is believed to have begun in the Mauryan period with the Ashokan pillars. During this period, the Sanchi Stupa and the sculptures at Bharhut were also set up.