Here's a problem to solve: A student mixes vinegar and baking soda to use in a volcano model. The mixture causes the volcano model to feel cool when it is touched. What energy transformation has taken place?

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

- A: light energy changed to heat energy
 
- B: heat energy changed to chemical energy
 
- C: chemical energy changed to heat energy
 
- D: chemical energy changed to light energy
 