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Mark was not cuddly as an infant, and when he should have been learning to speak and interact with his classmates in day care, he instead stayed to himself, waving his hands in front of his face for long periods of time. He has never learned to speak and seems indifferent to other people. He becomes very distressed if anyone moves objects around in his room. Mark most likely has __________.
A) mental retardation
B) attention deficit/hyperactivity disorder
C) childhood schizophrenia
D) autism
On Jul 01, 2024