Behavioral Science & Ethics USMLE Step 1 Practice Question

A 10-year-old boy is brought to the physician because of increasing behavior problems in school since starting 5th grade 3 months ago. His teacher states that he is unable to sit quietly through a classroom period and frequently disrupts the class and interrupts other children while they are talking. His parents report that he has always been an active child and are concerned because he is inattentive when he runs or walks. His temperature is 37.0°C, pulse is 80/min, blood pressure is 108/68 mmHg, and respiratory rate is 14/min. During examination, he fidgets with his hands and feet and is easily distracted from completing a task. Which of the following is the most appropriate pharmacotherapy?