Eight-year-old Rubio does not play with his classmates, and when he does have to interact with them he tends to get frustrated and doesn't understand how to interact with them. Even at home, Rubio doesn't initiate or reciprocate feelings of affection and tends to have a lack of emotional expression. Rubio has developed a special interest in trees and knows many of their names, growing locations, leaf types, and any other relevant information. He also has a large vocabulary and does well on his school assignments. Rubio is most likely diagnosed with

autism spectrum disorder.

ADHD.

specific learning disorder

communication disorder.