Heat from the room is absorbed by the ice cube. The ice cube molecules move more slowly. One side of the ice cube is colder than the other. Heat from the ice cube moves into the air.
I gave my students this multiple choice question: Which statement describes the reason why an ice cube melts when set out in a warm room?

Only one answer is correct among these 4 choices:
- Heat from the room is absorbed by the ice cube.
- The ice cube molecules move more slowly.
- One side of the ice cube is colder than the other.
- Heat from the ice cube moves into the air.

Could you tell me which one is correct?

Heat from the room is absorbed by the ice cube.