an ice cube melting the refrigerator an egg frying the toaster
I gave my students this multiple choice question: When heat flows from a hot spot to a cooler spot, entropy increases. When heat is forced to flow from a cool spot to a warmer spot, entropy decreases. Marta is looking for something in her house that causes a decrease in entropy. Which of these should she choose?

Only one answer is correct among these 4 choices:
- an ice cube melting
- the refrigerator
- an egg frying
- the toaster

Could you tell me which one is correct?

the refrigerator