Pollution can be eliminated through water testing. High temperatures increase runoff from agricultural fields. Water testing identifies origination of illegal dumping. Monitoring water quality is important to public health.
I gave my students this multiple choice question: Scientists frequently monitor levels of microorganisms at beaches in the summer time. High temperatures, pollution, runoff, and illegal dumping all affect water quality. What do these scientific efforts illustrate?

Only one answer is correct among these 4 choices:
- Pollution can be eliminated through water testing.
- High temperatures increase runoff from agricultural fields.
- Water testing identifies origination of illegal dumping.
- Monitoring water quality is important to public health.

Could you tell me which one is correct?

Monitoring water quality is important to public health.