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: soil is formed by rocks eroding, Fact2: Soils are formed by breakdown of rock., Question: what does rock erosion cause them to do? (A) turn gaseous (B) secrete h2o (C) breakdown (D) become hydrogen (E) they bend (F) dangerous (G) migrate (H) watershred
Output:
C