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: a rainbow is formed by refraction of light by separating light into all different colors, Fact2: Rainbow A most charming example of chromatic dispersion is a rainbow., Question: what is formed by refraction of light by separating light into all different colors? (A) reflection (B) an electron lens (C) chromatic dispersion (D) greenhouse gases (E) water condensation (F) deoxyribonucleic acid (G) Males and females (H) movement of tectonic plates
C