Option c is the correct answer. Sher Shah, the founder of the Sur Empire in the northern part of the Indian subcontinent, achieved significant victories. He defeated Nusrat Shah, the Sultan of Bengal, when the latter attacked south Bihar. Sher Shah then became the de facto ruler of south Bihar and took on the title of Hazrat-i-Ala. Additionally, he triumphed over Humayun in the Battle of Chausa in 1539 A.D., after which he assumed the title of Sher Shah Sultan-i-Adil.