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: rocks interacting with wind over long periods of time causes weathering, Fact2: Rocks weather at different rates., Question: what affects rocks? (A) rivers (B) force (C) mildew (D) wind (E) magma (F) Weight (G) soda (H) magnetism
D