Eva is in a closed, dark room. she uses her arm muscles to turn on a lamp. when she moves her hand closer to the lamp, the light heats her hand. the light bounces off the pages of a book and into her eyes.

if this room is a closed system, what happens to the total amount of energy in the room?

a.
it remains constant.

b.
it decreases.

c.
it increases, then decreases.

d.
it increases.