Correct Option: A

Although Surdas is known for his greatest work - the Sur Sagar, he has also sung Sur-Saravali, which is based on the theory of genesis and the festival of Holi, and Sahitya-Lahiri, devotional lyrics dedicated to the Supreme Absolute. Surdas' verse is also credited as one that lifted the literary value of Hindi language, transforming it from crude to a pleasing tongue.