mary ainsworth developed the strange situation as an assessment of parent-infant attachment. she observed that securely attached infants __________.O a do not seem to care when the mother leaves the room and do not see her out when she returns O b.cry if the mother leaves the room and welcome her back when she returres O c are not concerned when the mother awes, but cry to be picked up when she returns O d. protest loudly when the mother leaves, but resist contact with her when she returns