Instructions: 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").
Input: Fact1: decomposition increases amount of organic matter in soil, Fact2: Organic mulch improves the soil., Question: What improves the soil? (A) decomposition (B) erosion (C) green manures (D) evaporation (E) fire (F) nutrients (G) dehydration (H) water conservation
Output:
A