Answer: Option A
Explanation:
Any undesirable physical, chemical or biological substances in the environment is called as pollution. It can be water, land, soil, air, et cetera.
Pollution can be trackable which means its source is known and it can be reduced by controlling the pollutant from a single point. This kind of a pollution is point source pollution.
The pollution that does not comes from a single point and has more than one source of pollution is called non-point source pollution.
