Here's a problem to solve: Most farmers use fertilizers on their cornfields. Which statement best explains why farmers should not use excess amounts of fertilizers?

Among the 4 following options, which is the correct answer?

- A: Fertilizers may wash into streams.
 
- B: Fertilizers may be used by weeds.
 
- C: Fertilizers may evaporate into the air.
 
- D: Fertilizers may come from natural materials.
 