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.
I am hesitating between 4 options to answer the following question, which option should I choose?
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?
Possibilities:
- 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.

Sunlight can be separated into all the colors of the rainbow.