Mary Ainsworth Observed That Securely Attached Infants _______

Mary Ainsworth observed that securely attached infants _______.

A) did not seem to care when the mother left the room and did not seek her out on her return
B) protested loudly when the mother left, but resisted contact with her when she returned
C) got upset if the mother left the room, and were easily soothed and welcomed her back when she returned
D) were not concerned upon separation, but cried to be picked up and held on her return