You will be given a definition of a task first, then some input of the task.
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: decomposition increases amount of organic matter in soil, Fact2: Organic Matter Organic matter is the varied array of carbon-containing compounds in the soil., Question: What increases the amount of carbon-containing compounds in the soil? (A) nitrogen fixation (B) Greenhouse gasses (C) fossil fuels (D) chlorofluorocarbons (E) freezing (F) erosion (G) rainfall (H) decomposition
Output:
H