OPTIONS: [I] mutations. [II] sunlight. [III] earthquake. [IV] magma. [V] wind. [VI] light. [VII] Condensation. [VIII] flowers.
Given those answer options, answer the question: Fact 1: Arainbow is formed by refraction of light by separating light into all different colors. Fact 2: Rainbows form when raindrops refract sunlight. Given the two facts above, what causes rainbows?
A:
[II]