Mary Ainsworth observed that securely attached infants

a. do not seem to care when the mother leaves the room and do not seek her out on her return.
b. protest loudly when the mother leaves but resist contact with her when she returns.
c. cry if the mother leaves the room, are easily soothed, and welcome her back when she returns.
d. are not concerned upon separation but cry to be picked up and held on her return.
e. allow their parents to do whatever they want, as long as they have their own toys nearby.

c. cry if the mother leaves the room, are easily soothed, and welcome her back when she returns.