Question: 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?

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