The correct answer is (a) Ahmad Yadgar.
Ahmad Yadgar was a 16th-century historian who served as a courtier to Sher Shah Suri, the founder of the Sur Empire. He is best known for his book Tarikh-i-Shershahi, which is a chronicle of Sher Shah’s life and reign.
Abbas Sarwani was a 16th-century historian who served as a courtier to Akbar, the third Mughal emperor. He is best known for his book Tarikh-i-Akbari, which is a chronicle of Akbar’s life and reign.
Nizamuddin Ahmad was a 16th-century historian who served as a courtier to Humayun, the second Mughal emperor. He is best known for his book Tabaqat-i-Akbari, which is a chronicle of the Mughal Empire from its founding to the reign of Akbar.
Abdul Qadir Badayuni was a 16th-century historian who served as a courtier to Akbar. He is best known for his book Muntakhab-ut-Tawarikh, which is a chronicle of the Mughal Empire from its founding to the reign of Akbar.
Ahmad Yadgar’s Tarikh-i-Shershahi is the most important source for the life and reign of Sher Shah Suri. It is a detailed and well-written account that provides a valuable insight into the history of the Sur Empire.