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: soil erosion means soil loss through wind, Fact2: Soil erosion is a serious problem in production agriculture., Question: What can cause serious problems for production agriculture? (A) wind (B) rabies (C) fungi (D) mold (E) Acids (F) fire (G) mildew (H) mines
A