Final answer:
Children with Autism Spectrum Disorder (ASD) may exhibit repetitive/restrictive behaviors and interests, often seen in more severely impaired or younger children.
Step-by-step explanation:
A characteristic symptom of Autism Spectrum Disorder (ASD) is impaired social skills, repetitive motor behaviors, strict adherence to certain rituals, and preoccupation with specific subjects. These behaviors are more commonly observed in more severely impaired or younger children with ASD. For example, younger children may engage in repetitive motor behaviors such as rocking back and forth or hand flapping, while older children may have a narrow range of interests and display rigid adherence to certain routines or rituals.