Perfume and other aromatic things are prepared from khus, which is obtained from the roots of a type of grass? Tell me, in which of the following districts of Rajasthan, Khas grass grows?

• A. Alwar, Jhunjhunu and Jaipur
• B. Bharatpur, Sawai Madhopur and Tonk
• C. Ajmer, Bhilwara and Pali
• D. Nagaur, Jodhpur and Barmer