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: being exposed to wind can cause erosion of soil, Fact2: Erosion Soil erosion is the detachment and movement of soil materials by wind or water., Question: How does soil move in the air? (A) Slow. (B) roots (C) Wind (D) It follows the sun (E) porous (F) slow (G) Birds (H) Thunderstorms
C