The parent of a 6-year-old says. "My child is in constant motion and talks all the time. My child isn't interested in toys but is out of bed every morning before me." The child's behavior is most consistent with diagnostic criteria for

A. Communication disorders involve difficulties with speech, language, or communication (e.g., stuttering, limited vocabulary). The main problem here is hyperactivity, not speech/language impairment. B. ADHD is characterized by inattention, hyperactivity, and impulsivity. Behaviors such as being in constant motion, excessive talking, lack of sustained interest in activities, and getting up early with energy are hallmark signs of hyperactive/impulsive type ADHD. C. Intellectual development disorder (formerly mental retardation) involves below-average intellectual functioning and impaired adaptive skills, not constant hyperactivity and excessive talking. D. Stereotypic movement disorder is repetitive, purposeless motor behavior (e.g., hand flapping, head banging), not generalized hyperactivity and impulsivity.