The correct option is A Bhattiprolu stupa
Excavation undertaken in the year 1870 at Bhattiprolu stupa unearthed three mounds while the one carried out in 1892 led to the discovery of three inscribed stone relic caskets containing crystal caskets, relics of Buddha and jewels. The diameter of the stupa measures around 40 m with an additional basement of 2.4 m wide running all around. The most important discovery is the crystal relic casket of sarira dhatu of the Buddha from the central mass of the stupas.