Zachary is a 5-year-old child who has difficulty making eye contact, shows no interest in interacting with his peers, and is easily overwhelmed by noises in the environment. Despite that, Zachary can read simple sentences and makes intricate drawings of animals and plants. Zachary would most likely be tested for which of the following disorders?

Attention-deficit/hyperactivity disorder (ADHD) primarily involves symptoms related to inattention, hyperactivity, and impulsivity. While some children with ADHD may also have social difficulties, Zachary's specific challenges with eye contact and sensory overload are not typical indicators of ADHD, making this choice less likely.

Obsessive-compulsive disorder (OCD) is characterized by persistent, unwanted thoughts (obsessions) and repetitive behaviors (compulsions) aimed at reducing anxiety. Zachary’s behaviors do not indicate compulsions or obsessions, and his difficulties seem more rooted in social interaction and sensory processing rather than anxiety-driven compulsive actions.

Oppositional defiant disorder (ODD) is marked by a pattern of angry or irritable mood, argumentative behavior, and vindictiveness. Zachary's symptoms do not align with defiance or oppositional behavior; instead, his challenges relate more to social engagement and sensory experiences, making this diagnosis unlikely.