Final answer:
Eddie is most likely to have Autism Spectrum Disorder (ASD).
Step-by-step explanation:
The symptoms mentioned suggest that Eddie is most likely to have Autism Spectrum Disorder (ASD).
Autism is a neurodevelopmental disorder that affects social interaction, communication skills, and behavior. Individuals with autism often have repetitive behaviors, restricted interests, and difficulties with social communication. The symptoms described in the question, such as temper tantrums, preoccupation with specific toys, and echolalia (repeating other people's words), are commonly seen in children with ASD.