Ganganagar, Hanumangarh, Churu, Jhunjhunu, Sikar, Nagaur, Bikaner, Jodhpur, Jaisalmer, Barmer, Jalore and Pali (12 districts) etc. are included in which state of Rajasthan?

• A. North-West desert region
• B. Central Aravali mountainous region
• C. eastern plains
• D. Southeastern plateau region