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 one way mammals and other animals learn how to behave., Fact2: Dogs learn many social rules through play., Question: How are dogs trained on how to behave? (A) Summer (B) during the day (C) By getting older (D) Movement (E) exercise (F) By sleeping (G) Through walks (H) Through play
H