Definition: 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").
Input: Fact1: sunlight and rain can cause a rainbow, Fact2: Rainbows Rainbows are important symbols to the Navajo people., Question: what can cause an important symbol to the Navajo people? (A) density (B) energy of moving objects (C) sunlight and rain (D) volume (E) colors of the spectrum (F) mass (G) rain or sun shine (H) rays or beams
Output:
C