Each of the subtypes of attention-deficit/hyperactivity disorder has a different pattern of comorbidity. What have researchers concluded from this observation?
A) A variety of gene locations probably combine to produce the behaviors associated with ADHD.
B) There seems to be one predominant type of ADHD that manifests itself differently, depending on the environmental circumstances.
C) The various manifestations of ADHD suggest that it is not likely that genetic factors play a significant role in the development of this
disorder.
D) The multiple manifestations of this disorder suggest that various sites in the control centers of the brain are impacted early in life and do not recover.
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