Answer the following question given this paragraph: 

Pollution that enters water at just one point is called point source pollution . For example, chemicals from a factory might empty into a stream through a pipe or set of pipes (see Figure below ). Pollution that enters in many places is called non-point source pollution . This means that the pollution is from multiple sources. With non-point source pollution, runoff may carry the pollution into a body of water. Which type of pollution do you think is harder to control?.


Q: What is pollution that enters water at just one point called?

 Choices:

- entry point pollution

- point supply pollution

- point supply pollution

- point source pollution

A:
point source pollution
