Given the task definition and input, reply with output. 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: wind and rain cause erosion, Fact2: Erosion is the wearing away of earth or rock., Question: Wind can cause? (A) nuclear fusion (B) scattered light (C) the wearing away of rock (D) destruction of energy (E) Electrical energy (F) faster movement (G) forest is destroyed (H) continents to shift
C