Use this fact to answer the question: a mirror reflects light

A boy is standing in the bathroom brushing his teeth, but the lights are off in the bathroom. However, his room is next to the bathroom and his bedroom light is on. The bathroom is still bright, because the mirror reflects

Available choices:
(1). light from a car
(2). light from the sun
(3). light from the bathroom
(4). light from the bedroom

The answer is:
(4).