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: heat and pressure change the remains of prehistoric living things into natural gas, Fact2: Heat and pressure cause a rock to metamorphize., Question: What can change the remains of prehistoric living things into natural gas? (A) rock metamorphizing (B) a hydraulic system (C) Time and energy (D) the ground shaking (E) Temperature (F) one celled organisms (G) chemical reaction (H) flow of electrons
A