I believe the answer is D. secure attachment.
It would be easy if you knew the difference between secure and insecure attachment: according to research, a child with insecure attachment will avoid or ignore the caregiver and a child with secure attachment feel protected by their caregiver.
If Sandra clings onto her mother's skirt, it shows that she feels like her mother will protect her from strangers.
They must learn that an object still exists even though they can’t see it.
during the last 100 feet or atleast 5 seconds before changing lanes