Fertilizers may wash into streams. Fertilizers may be used by weeds. Fertilizers may evaporate into the air. Fertilizers may come from natural materials.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Most farmers use fertilizers on their cornfields. Which statement best explains why farmers should not use excess amounts of fertilizers?
Possibilities:
- Fertilizers may wash into streams.
- Fertilizers may be used by weeds.
- Fertilizers may evaporate into the air.
- Fertilizers may come from natural materials.

Fertilizers may wash into streams.