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 causes erosion, Fact2: Erosion affects farm viability., Question: What affects farm viaility? (A) mines (B) heat (C) marine life (D) mold (E) wind (F) potatoes (G) stars (H) mildew
E