Option c is the correct answer. The Delhi Sultanate literature began with the rise of Persian speaking people to the throne of the Sultanate of Delhi, naturally resulted in the spread of the Persian language in India. It was the official language and soon literary works in the language began to appear. Tarikh and Tawarikh, sources of information on Delhi Sultans, were written in Persian. It was also the language for administration. During the Delhi Sultanate many important works were written in Persian, including the Tabaqat-i-Nasiri by Minhaj-i-Siraj and the Fatawa-i-Jahandari by Zia-ud-din Barani.