Which Is True According to Research on Parent-Child Attachments

Which is true according to research on parent-child attachments?

A) Parental responsiveness to an infant does not appear to be a determinant of the type of attachment formed by the infant.
B) It is not possible for an infant to attach securely to its father unless it first establishes a secure attachment with its mother.
C) Infants who are securely attached to both parents are more socially competent than those who are securely attached only to mother.
D) Attachment to mother predicts later social competence, while attachment to father does not.