The first line of treatment for attention deficit-hyperactivity disorder (ADHD) is:

Rationale: A. Antidepressants may be used in ADHD when comorbid mood disorders are present but are not first-line therapy for core ADHD symptoms. B. Stimulants, such as methylphenidate or amphetamine-based medications, are the first-line treatment for ADHD. They have the most robust evidence for improving attention, hyperactivity, and impulsivity in children and adolescents. C. Benzodiazepines are not indicated for ADHD and may worsen attention and behavior. D. SSRIs are used primarily for anxiety or depression and do not address the core symptoms of ADHD.