The correct options are
A Treatment of industrial waste before dumping
B Treatment of sewage waste before dumping
∙ Water bodies get polluted due to many human activities like washing or dumping wastes.
∙ To prevent pollution of water bodies:
- We should not wash our clothes and bath animals in the rivers.
- Sewage and industrial wastes should not be dumped directly into rivers. These wastes must be treated and cleaned before letting out to the water bodies.