Which one among the following was the objective of starting the Nirmal Gram Puraskar incentive scheme ?

• A. Encourage Panchayati Raj Institutions to take up sanitation promotion for attaining 100% open defecation - free environment
• B. Enable rural schools to provide safe and clean drinking water for children
• C. Provide toilets to all rural households
• D. Provide financial assistance to States to install water purification systems in rural schools