Which of the following is NOT a point source?a.Underground minesb.Runoff of from a livestock feedlotc.Oil tankersd.Factory effluent

The option that is NOT a point source is b. Runoff from a livestock feedlot.

Point source pollution comes from a single, identifiable source. This includes things like underground mines (option a), oil tankers (option c), and factory effluent (option d) because these all have a specific, identifiable origin.

On the other hand, runoff from a livestock feedlot (option b) is considered non-point source pollution. This is because it doesn't come from a single, identifiable source. Instead, it comes from a broad area (the entire feedlot) and can be caused by various factors such as rainfall or snowmelt moving over and through the ground. As the runoff moves, it picks up and carries away pollutants, depositing them into lakes, rivers, wetlands, coastal waters, and even underground sources of drinking water.