Given the task definition and input, reply with output. In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").

How can we see that refracting sunlight causes light to split into different colors? (A) shining a light at a mirror (B) letting sunlight hit a broken mirror (C) setting a diamond outside on a bright day (D) shining a flashlight at broken glass on the floor
C