The correct option is D Krishna
The Nagarjunakonda stupa was part of Vijayapuri, the capital city of Ikshvaku kings. It was on the banks of the Krishna River. Vijayapuri had a large number of stupas, viharas and palaces. It also had a beautifully designed amphi theatre and ghats leading to the river. Unfortunately, today the entire city lies under water submerged in the Nagarjunasagar dam.