Which of the following is an example of the first law of thermodynamics ?

Options

A. The specific heat of an object explains how easily it changestemperatures.
B. While melting, an ice cube remains at the
same temperature.
C. When a refrigerator is unplugged,
everything inside of it returns to room
temperature after some time.
D. After falling down the hill, a ball's kinetic
energy plus heat energy equals the initial
potential energy