“Attitude” is something that can be controlled by the mind, your values, your teachers. Example: “Even though she was going through a lot, she had a positive attitude.”. Her attitude was controlled by her mindset. “Behavior” is something more unconscious, that expresses the person’s feelings and emotions. Example: “The child’s behavior made the parents laugh.”. Here you couldn’t use “attitude”, cause the question is about a small child that expresses his/her emotions in a certain way. I hope it helps!