A student wrote steps to show the energy transformations involved in producing, eating, and digesting food. Which step shows an incorrect transformation?

a. Radiant energy from the sun changes to chemical energy in a plant.

b. When an animal eats a plant, chemical energy in the plant changes to radiant energy from the sun.

c. After an animal eats a plant, chemical energy changes to thermal energy.

d. In the animal’s body, chemical energy is converted into mechanical energy when it’s used for muscle movement.