Here's a problem to solve: Some species of bacteria produce a substance that is toxic to insects but harmless to humans. Scientists have isolated the gene that controls production of this substance. Which of the following is the best reason for inserting this gene into corn plants?

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

- A: The corn will grow faster.
 
- B: Less fertilizer will be needed.
 
- C: Fewer pesticides will be needed.
 
- D: The corn will be more nutritious.
 