Given the task definition and input, reply with output. In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").

Fact1: refracting sunlight causes sunlight to split into different colors, Fact2: Refraction Refraction is the bending of light rays., Question: what causes sunlight to split into different colors? (A) bending of light rays (B) focusing a lens (C) converting electricity to heat (D) increasing electrons (E) reflections (F) heat energy (G) adding h2o (H) an electron lens
A