It was found that water from a river was contaminated with Coliform bacteria. Which one of the following pollutants might have got mixed with the water?

The pollutant which might have got mixed with the water is human faecal matter because E. coli is an inhabitant of the human gut, so their presence is indicative of faecal contamination.

OR

iv) The industrialists

Various industrialists depend on forest for many of their raw materials and set up industries which does a lot of harm to the forest. Industries can destroy habitat for animals and can bring about an imbalance in the ecosystem.