The correct option is A Marwar
Maharaja Jaswant Singh was the ruler of Marwar. Jaswant Singh Rathore was a maharaja of Marwar in the present-day Indian state of Rajasthan. His father was Maharaja Gaj Singh. He was a distinguished man of letters and author of "Siddhant-bodh", "Anand Vilas" and "Bhasa-bhusan" He was the Subedar of Assam from 1656-1666.