Here's a problem to solve: A group of students observed the formation of bubbles when water boiled. What happened to matter because of the physical change to the water?

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

- A: New matter was created in the bubbles.
 
- B: Old matter was destroyed as the water turned to gas.
 
- C: Matter was conserved when it changed form.
 
- D: The composition of the matter changed.
 