Here's a problem to solve: A simple food chain includes hawks, lizards, and insects. Which will most likely happen to the lizard and hawk populations if a pesticide is sprayed to kill the insects, and the lizard and hawk populations cannot find other food in this ecosystem?

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

- A: Both the lizard population and the hawk population will increase.
 
- B: Both the lizard population and the hawk population will decrease.
 
- C: The lizard population will increase, but the hawk population will decrease.
 
- D: The lizard population will decrease, but the hawk population will increase.
 