Correct Answer: (a) Shershah
Solution:According to the details available in Tarikh-i-Daudi, Sher Shah in 1541 built a strong fort in Patna, keeping in mind it's geographical and strategic importance. He made this city the capital of Bihar. The ancient name of Patna was Pataliputra which was built by Haryank King Ajatashatru. The successor of Ajatashatru, Udayin made Pataliputra (Patna) the capital of his kingdom. Pataliputra remained the glorious capital of empires – Haryank, Nanda, Maurya etc. for more than three centuries.