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: sunlight and rain can cause a rainbow, Fact2: Behind each storm there's a rainbow., Question: what breaking through rain comes after a storm (A) erosion (B) fog (C) lightning (D) mountains (E) flooding (F) sunlight (G) It expands (H) water vapor
F