The correct option is B Because he was an able warrior who ended up destroying several Kshatriya empires.
Mahapadma Nanda was a Shudra by birth who assumed kingship after killing his father. The Puranas described him as Sarva-kshatrantaka, which means the destroyer of all Kshatriyas as he had exterminated various famous Kshatriya kings like Maithalas, Kasheyas, Ikshvakus etc.