Which Piece of Evidence Is the BEST Support for the Causal

Multiple Choice

Which piece of evidence is the BEST support for the causal effect of infant attachment security on later social functioning?

A) Children who are securely attached as infants are more likely than other children to be socially and emotionally competent.
B) When security of attachment changes because of stress in the home, parent child interactions at the time are associated with social and emotional competence at that age.
C) Children who had a secure attachment during infancy are more socially and emotionally competent in middle childhood than are other children.
D) There is no association between infant attachment security and social functioning.