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 am hesitating between 4 options to answer the following question, which option should I choose?
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?
Possibilities:
- 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.

Monitoring water quality is important to public health.