The correct option is D They reduce quality of crop yield in Punjab
Waste from chemical fertilizers from Nangal, effluents from many factories in Ludhiana, effluents of leather industries in Jalandhar and Nakodar pollute the Satluj and its tributaries. Farmers in a majority of villages running along the banks of the river have pumped this dirty water directly to irrigate their crops. These waters are hazardous to crops and groundwater, as they carry heavy metals like lead, arsenic, cadmium, etc. These are very harmful to health if consumed.