An 8-year-old girl presents with a history of normal vocabulary and grammar skills, but she is unable to use language to share ideas and feelings. Beginning in early childhood, she has been unable to make good eye contact and has difficulty reading social cues. These characteristics have led to difficulty making friends. Her social skills are further complicated by her obsession with light bulbs, which she repetitively draws on virtually any piece of paper she can find. She excessively smells shiny objects that catch her eye. She has rituals for getting dressed that cause significant distress if they are interrupted in any way. All of these symptoms have caused significant impairment in her functioning. What diagnosis best fits her presentation?

Choice A reason: This is correct. The child exhibits core features of autism spectrum disorder (ASD), including deficits in social communication, restricted and repetitive behaviors, and sensory interests (smelling shiny objects), leading to functional impairment. Choice B reason: Rett syndrome primarily affects girls and involves regression in motor skills and language after a period of normal development, which does not match this presentation. Choice C reason: Intellectual disability involves deficits in intellectual and adaptive functioning across multiple domains. This child has normal intellectual abilities, as evidenced by vocabulary and grammar skills, making intellectual disability less likely. Choice D reason: Social communication disorder involves difficulties with social use of language but does not include repetitive behaviors or sensory interests, which are present here.