As water drains off and eventually combines at a central point in a watershed, it picks up different types of surface pollution left over from agricultural, industrial, commercial, and other types of human activity. taking a look at the big picture, where is the final resting point for all of the pollutants? a) lakes become the final collection point for tons of pollution b) rivers become the final collection point for tons of pollution c) oceans become the final collection point for tons of pollution d) marshes become the final collection point for tons of pollution