Here's a problem to solve: Alicia put hydrogen peroxide and yeast in a paper cup. The paper cup felt hot, and she concluded that a reaction occurred that gave off heat. What else could Alicia do to get a more accurate conclusion?

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

- A: use an insulated cup rather than a paper cup
 
- B: change the amount of hydrogen peroxide used
 
- C: take a picture of the cup after the reaction took place
 
- D: use a thermometer to measure the change in temperature
 