The correct option is B Shah Nama
According to legend, Sultan Mahmud Ghazni offered Firdosi a gold piece for every couplet of the Shah Nama he wrote. The poet agreed to receive the money as a lump sum when he had completed the epic. After thirty years of work, Firdosi finished his masterpiece. Shah Nama consisted of more than 50,000 couplets about the history of Persia.