3. Denise was driving east over a hill in the afternoon, shortly after a rain shower. Suddenly the sun broke through the clouds, and she saw a rainbow ahead of her. Which of the following made the rainbow possible?
A. Overhead black clouds reflect puddles to cause a mirage.
B. Air pollution causes the sky to look colored under these conditions.
C. Sunlight can be separated into all the colors of the rainbow.
D. Water reflects sunlight like a mirror to make it look colored.