Ms. Garcia demonstrates heat transfer for her students by placing an ice cube in a glass of warm water and stirring the water with a straw. Which statement below best describes what is happening?

A. The total thermal energy of the glass of water increases.

B. The cold from the ice cube moves to the water in the glass.

C. The ice cube melts as the water reaches thermal equilibrium.

D. The heat from the water moves to the surrounding air, melting the ice cube.