Which practice is NOT considered an environmentally responsible approach in solid waste management within civil engineering?

A$)$ Implementing landfill liners and leachate collection systems to prevent groundwater contamination.

B$)$ Adopting integrated waste management systems that prioritize recycling and resource recovery.

C$)$ Dumping untreated sewage sludge directly into rivers and water bodies.

D$)$ Designing sustainable waste$-$to$-$energy facilities to reduce reliance on fossil fuels