What Seems Obvious After Learning About Both Attachment and Nonparental

What seems obvious after learning about both attachment and nonparental care?

A) Young children in nonparental care could never form a secure attachment with parents.
B) The research on attachment and nonparental care is inconsistent and inconclusive.
C) Children attending nonparental care settings do just as well as those reared at home.
D) Children in nonparental care settings are more advanced socially but less advanced cognitively than their home reared counterparts.