Final answer:
The child who actively approaches and interacts with unfamiliar adults after experiencing social neglect or deprivation is most accurately diagnosed as having a Disinhibited social engagement disorder.
Step-by-step explanation:
The child who actively approaches and interacts with unfamiliar adults after experiencing social neglect or deprivation is most accurately diagnosed as having a Disinhibited social engagement disorder, which is characterized by a lack of fear or hesitation in approaching unfamiliar adults and a failure to develop appropriate selective attachments.
This behavior is seen in children who have experienced relational trauma or severe neglect, leading to a lack of trust and indiscriminate social behavior.
Other disorders such as Posttraumatic Stress Disorder (PTSD) and Reactive Attachment Disorder (RAD) may also be considered, but Disinhibited Social Engagement Disorder is the most accurate diagnosis for this specific behavior.