Correct Response: D. A healthy, secure attachment to a caregiver helps calm and comfort an infant. According to the National Association for the Education of Young Children, the resulting sense of security teaches infants that people care for them and encourages development of social skills that lead to close relationships. Forming a healthy, secure attachment can occur in the absence of activities such as reading books or listening to music, which can stimulate language acquisition (B) and cognition (C). Motivation (A) is an indirect result that may arise from a feeling of confidence prompted by a healthy, secure attachment.