The correct option is D Implementing better sewage management systems
Controlling industrial dumping, and proper treatment of sewage water are necessary steps towards reducing and preventing further contamination of the rivers of Punjab. The Punjab Pollution Control Board controls pollution at the source by enforcing standards on chemicals and wastes dumped into the rivers. They monitor the water quality of major rivers and groundwater and ensure they are not polluted by the discharge of untreated city sewage and industrial waste. Farmers can help by reducing the use of chemical fertilisers to improve the quality of crops.