The correct answer is (a) Bharatmuni.
Bharatmuni was a sage and philosopher who lived in ancient India. He is credited with being the author of the Natyashastra, a treatise on the performing arts. The Natyashastra is one of the most important texts on Indian dance, music, and drama. It is considered to be the foundational text of Indian classical dance.
Bhasa was a playwright who lived in ancient India. He is credited with writing over 13 plays, which are considered to be some of the finest examples of Sanskrit drama.
Vasumitra was a Buddhist monk who lived in ancient India. He is credited with writing the Asanga-Vasumitra-samhita, a treatise on Buddhist philosophy.
Nagarjuna was a Buddhist philosopher who lived in ancient India. He is credited with founding the Madhyamaka school of Buddhist philosophy.
The Natyashastra is a vast and complex text that covers a wide range of topics, including the history of the performing arts, the theory of drama, the techniques of acting, dancing, and music, and the construction of theaters. It is an essential text for anyone interested in the performing arts of India.