Detailed Instructions: 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").
Q: Fact1: soil is formed by rocks eroding, Fact2: Rivers erode the rocks they flow over., Question: What do rivers do to rocks? (A) storing water (B) to move people (C) they bend (D) Make them get bigger (E) It has no effect on rocks (F) Polish them (G) Turn it to soil (H) protect them
A:
G