Answer:
when their mother was present
Step-by-step explanation:
Through an experiment Mary ainsworth found that the behavior of one-year-olds is divergent, that is, depending on the type of bond they have established with their mother, will react to the different situations presented. Children, called “firmly bound”, that is, with secure attachment, explore, play with toys, approaching the stranger with care, only when the mother is present. However, when the mother leaves the room the child seems to lose the desire to explore the environment and play with toys.