Which attachment style best describes an infant who seems largely unaffected by their mother's presence, shows little distress when she leaves, and avoids her upon return, according to Mary Ainsworth's research?

Explanation

In Mary Ainsworth's attachment theory, an infant displaying little reaction to the mother's presence or absence and avoiding contact upon her return is classified as having an avoidant (insecure) attachment style. This contrasts with secure attachment, where the infant seeks comfort, and resistant attachment, where the infant is highly distressed and clingy.