Which normally maturing infant would be most likely to have just formed his first specific attachment?

Question

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According to Bowlby's attachment theory, infants typically start forming specific attachments to one or a few primary caregivers around 6-8 months of age. Therefore, Henry, who is 8 months old, would be the most likely to have formed his first specific attachment. Infants who are 1 day old (A) are too young to have formed specific attachments, and infants who are 4 months old (B) or 12 months old (D) may have already formed specific attachments.

Which Normally Maturing Infant Would Be Most Likely to Have