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: Balance is the ability to sense and maintain body position., Fact2: Balance refers to the ability to maintain equilibrium and to remain in a stable, upright position., Question: the ability to maintain equilibrium is the ability to sense and maintain what? (A) body hair (B) temperature (C) movement (D) body position (E) body shape (F) body integrity (G) temperature changes (H) kinetic energy
A:
D