Here's a problem to solve: Paul observes four different samples of water. He records the temperature and volume of each sample. Which of his samples contains the greatest amount of thermal energy?

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

- A: 100 mL of 10°C water
 
- B: 100 mL of 25°C water
 
- C: 5 liters of 10°C water
 
- D: 5 liters of 25°C water
 