Here's a problem to solve: Which of these is a physical change that takes place in a garden?

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

- A: Insects eat the leaves of a plant for food.
 
- B: Flowers grow after a summer rain shower.
 
- C: Earthworms loosen soil as they travel through it.
 
- D: Leaves convert sunlight to sugar by photosynthesis.
 