The information above provides evidence to support which of the following hypotheses? A. For babies, the survival advantage of smiling consists in bonding the caregiver to the infant. B. Babies do not smile when no one else is present. C. The smiling response depends on an inborn trait determining a certain pattern of development. D. Smiling between persons basically signals a mutual lack of aggressive intent. E. When a baby begins smiling, its caregivers begin responding to it as they would to a person in conversation.