The Nirmal Gram Puraskar is related to the Indian government`s programmes aimed at rural development.

Option 1 suggests it`s a scholarship scheme for single-child families in villages, but this is incorrect.

Option 2 suggests it`s a scholarship for rural female sportspersons representing their states. This is also incorrect.

Option 3 suggests it`s an incentive scheme for schools in villages for computer education. This is not accurate either.

Indeed, option 4 is the correct answer. The Nirmal Gram Puraskar is an incentive scheme for Panchayati Raj Institutions (local self-governance system in rural India). This award is given to the Panchayats who have done exceptional work in the field of sanitation, cleanliness and infrastructure development. This programme encourages these institutions to maintain cleanliness and improve basic amenities in their regions.