Detailed 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").
Q: Fact1: when an animal moves , chemical energy is converted to mechanical energy, Fact2: Digestive processes include mechanical, chemical and enzymatic mechanisms., Question: what makes it possible for an animal to move? (A) Limbs (B) four limbs (C) digestion (D) stamina (E) motility (F) magnets (G) radiation (H) weather
A:
C