Concept:DEWATS stands for a system that treats wastewater locally rather than at a centralized plant. Explanation:DEWATS is a natural treatment method using organic processes. It reduces foul smells and waterlogging, especially during monsoons. Wastewater from homes, industries, and hospitals is collected in drains and sent to a central treatment plant. The biochemical oxygen demand (BOD) is lowered. Treated water is reused for irrigation or safely disposed. DEWATS uses local labor and community management. It is built with bioremediation techniques adapted to specific needs. The main goal is to improve environmental quality. Hence, the full form is Decentralized Wastewater Management System. Answer:C. Decentralized Wastewater Management System