Option b is the correct answer. The famous historian who visited India with Mahmud of Ghazni was Al-Beruni. Al-Biruni, also known as Abu Rayhan Muhammad ibn Ahmad Al-Biruni, was a renowned Persian scholar, historian, and polymath. He accompanied Mahmud of Ghazni during his invasions into India in the 11th century. Al-Biruni made significant contributions to the understanding of Indian culture, religion, and society through his extensive observations and writings, including his famous work "Tahqiq-i-Hind". Important Tips Firishta (1570-1620) was a Persian historian active in the Deccan Sultanate's court, notably Ibrahim Adil Shah II. His work "Tarikh-i-Firishta" encompasses Indian history, focusing on dynasties and regions. Although his Ottoman origin claim for Yusuf Adil Shah is debated, his account remains valuable. Firishta's extensive historical work holds insights into India's past, contributing significantly to historical understanding. Shams-i-Siraj Afif, a prominent poet in Firoz Tughlaq's court, authored "Tarikh-e-Firoz Shahi" in five sections. This extensive work meticulously chronicles Firoz Tughlaq's reign, serving as a vital historical document of the era.