Twelve-month-old joshua enters an unfamiliar laboratory playroom with his mother. when she leaves, he gets distressed. when she returns, he runs to her and hugs her close. after this intense reunion, he returns to playing. joshua demonstrates the characteristics of attachment.

joshua demonstrates the characteristics of: Secure attachment

Secure attachment is a situation when a child feel an enormous amount of anxiety if the child is not around his/her usual care-giver.
In most cases, if the caregivers do not handle this quickly, the child will have the tendency to be difficult to adapt to other children among his/her age

The answer should be a.