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: knowledge of the stars can be used to navigate, Fact2: Of course, astronomers also study stars., Question: What can be used to navigate? (A) music (B) backbones (C) astrology (D) cilia (E) magic (F) sponges (G) astronomy (H) lamphreys
G

Fact1: Playing is just one of many ways that mammals and other animals learn how to behave., Fact2: Acting is about behaving., Question: What is one of the ways that mammals and other animals learn how to act? (A) sleeping (B) Movement (C) mating (D) exercise (E) eating (F) sound (G) playing (H) motion
G

Fact1: Reproduction is the process by which living things give rise to offspring., Fact2: Human offspring are completely immobile., Question: what creates a completely immobile human? (A) burning coal (B) birthdays (C) lungs (D) tectonic plates (E) sports (F) reproduction (G) our nearest star (H) fossil fuels

F