Which Two Conditions Were Precursers for an Insecure Attachment Found

Which two conditions were precursers for an insecure attachment found by the NICHD team?

A) single parent families and low-quality child care.
B) mother's level of education and the child's temperament.
C) the number of hours spent in child care per week and the income of the parents.
D) the age of the child when he or she first entered child care and the number of children in the family.
E) an insensitive mother and low-quality child care.