Given the task definition and input, reply with output. You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each 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?
(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.
A