Main source(s) of water pollution is/are
Soil erosion
Sewage and detergents
Both 1 & 2
None of these
As we have learnt,
Water Pollution can be caused due to man-made sources e.g. domestic waste, sewage, detergents, industrial wastes, etc. and also due to natural sources e.g soil erosion
Hence, the correct answer is Option (3)