ANSWER:
The correct option is C- Point source pollution.
Step-by-step explanation:
Point source pollution is an identifiable source of pollution from which pollutants are discharged. Since the manufacturing unit has been identified as the source of polluting the nearby river, it is the point source of pollution.
Factories and sewerage treatment plants are common point source pollutants. Pollution is basically the "contamination of water or air" by pollutants. The pollutants degrade the quality of water or air making them unfit for use.