Which Statement Best Reflects the Impact of Day-Care on Attachment

Which statement best reflects the impact of day-care on attachment

A)  Attachment, once established, cannot be changed and for this reason no research is required on the topic. 
B)  Very little research supports the notion that day-care does not have a harmful effect on children's attachment relationships. 
C)  Research mostly suggests that day-care has a harmful effect on children's attachment relationships. 
D)  Research mostly suggests that day-care does not have a harmful effect on children's attachment relationships.