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?
Sunlight can be separated into all the colors of the rainbow. Water reflects sunlight like a mirror to make it look colored. Overhead black clouds reflect in puddles to cause a mirage. Air pollution causes the sky to look colored under these conditions.
A B C D