Final answer:
Autism Spectrum Disorder (ASD) is a disorder that appears in childhood and involves deficiencies in communication, rigidly fixated interests, and repetitive behaviors.
Step-by-step explanation:
Autism Spectrum Disorders (ASD) encompass a group of developmental brain disorders that are characterized by deficits in social interaction, verbal and nonverbal communication, and engagement in repetitive behaviors or interests. It appears in childhood and involves deficiencies in communication, rigidly fixated interests, and repetitive behaviors. Autism Spectrum Disorder (ASD) is the correct answer.