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: the looseness of soil increases the amount of oxygen in that soil, Fact2: Soil oxygen effects on root development., Question: Why does it help for dirt to be loose? (A) Physical weathering (B) adding heat (C) It used to be covered by water (D) permineralization (E) water conservation (F) Roots get more oxygen (G) The area was once underwater (H) Riding a bike
Output:
F