Mary Ainsworth Observed That Securely Attached Infants

Mary Ainsworth observed that securely attached infants:

A) are not concerned upon separation, but cry to be picked up and held on her return.
B) cry or protest if the mother leaves the room and welcome her back when she returns.
C) protest loudly when the mother leaves, but resist contact with her when she returns.
D) do not seem to care when the mother leaves the room and do not seek her out on her return.