Micropollutants are manmade pollutants found in low concentrations that can be toxic; they are not named for their small molecule size.
The statement that is incorrect about micropollutants is c) They are called "micro" because of the small molecule size. Micropollutants are manmade (anthropogenic) pollutants that are typically present in low concentrations and can be toxic. They are not named "micro" because of their small molecule size, but rather due to their small size in general.