Question: When you are riding a bicycle at night, your bicycle's reflectors help people in cars see your bicycle. How do bicycle reflectors work?

What is the correct answer to the question from the following choices?
OPT:
(1). They are made of a special material that gives off its own light.
(2). They are hooked up to batteries that allow them to produce light.
(3). They bounce light back from other sources.
(4). They are covered with paint that glows in the dark.
(3).