Which is least likely to be impacted by runoff from a factory

Factory runoff has a great impact to the environment especially if runoff is situated near river and water areas. Spilled chemicals in a runoff can cause algal bloom that kills aquatic animals by depleting water in oxygen. By polluting the waterways, pathogens may thrive and can harm not only animals but also humans. Those pathogens can be transferred to the local water supply and can be consumed by the residents.

i think it's c