An 8-month-old infant who cries when a relative she has never met comes to visit is showing

A) anxious attachment.
B) poor socialization.
C) stranger anxiety.
D) separation anxiety.

Stranger anxiety is a common development stage in infants around 8-10 months old. It is a sign that the infant has formed an attachment to their primary caregiver and now perceives unfamiliar people as potential threats. It is a normal part of social and emotional development and typically disappears as the child grows older. Therefore, the infant is showing stranger anxiety when crying at the sight of a new visitor or relative.