The correct option is D Sarvavarma
Śarvavarma —A reputed grammarian who is believed to have been a contemporary of the poet Gunadhya in the court of Satavahana. He wrote the Grammar rules which are named the Katantra Sutras which are mostly based on the Sutras of Panini. In the grammar treatise named 'the Katantra Sutra' written by Sarvavarman, the Vedic section and all the intricacies and difficult elements are carefully and scrupulously omitted by him, with a view to making his grammar useful for beginners and students of average intelligence.