Here's a problem to solve: Which statement is an example of how humans have changed the natural environment?

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

- A: Wind and rain destroy wheat plants.
 
- B: The Sun's energy helps a wheat plant grow.
 
- C: A forest is cleared to make space to plant wheat.
 
- D: A wheat plant's seeds are scattered by the wind.
 