Correct Option: D

Ballalasena assumed the title 'Nihsanka - sankara'. According to Sena epigraph, Ballal was an author. He wrote Danasagara in 1168. And in 1169, he started but did not finish writing Adbhutasagara. In Adbhutasagara, it was mentioned that Ballalsen conquered Mithila while Vijaysen was still alive. Besides he introduced the practice of Kulinism.