Given the task definition and input, reply with output. 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: being burried under soil and mud changes peat into coal through extreme heat and pressure in a swamp over a long period of time, Fact2: Dead plants provide peat moss., Question: What changes into coal when buried under soil and mud? (A) rocks (B) sun (C) animals (D) cellulose (E) moon (F) plants (G) Newton (H) tunicates
F