The answer is Surdas's Sahitya Lahiri. Primary sources help students relate in a personal way to events of the past and promote a deeper understanding of history as a series of human events. Because primary sources are incomplete snippets of history, each one represents a mystery that students can only explore further by finding new pieces of evidence. ?Surdas was a 16th-century blind Hindu devotional poet and singer, who was known for his works written in praise of Krishna, the supreme lord. Surdas's Sahitya Lahri is one of the main primary sources to know about the medieval period of history. ?Mistake PointsAshoka's Inscription, Kalidasa's Abhijana Shakuntala, and Ravikirti's Prashasti are the Ancient historical sources. Hence, Surdas's Sahitya Lahari is a primary source to understand the medieval History of India.