Definition: 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: being burried under soil and mud changes vegetation into peat through extreme heat and pressure in a swamp over a long period of time, Fact2: Fossils are typically preserved when they are buried under many layers of sand and mud., Question: being preserved under many layers changes vegetation into peat through extreme what? (A) Physical weathering (B) Wet weather (C) heat and mud (D) Time and energy (E) scarce resources (F) heat and pressure (G) heat and vegetation (H) sand and pressure
Output:
F