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: Playing is just one of many ways that mammals and other animals learn how to behave., Fact2: Mammals include dogs, cats, and horses., Question: what uses play as a way to learn how to behave? (A) koalas (B) bears (C) dogs (D) clouds (E) humans (F) otters (G) plants (H) theater
C