Which of the following is a characteristic of ADHD?

A key characteristic of ADHD (Attention-Deficit/Hyperactivity Disorder) is the tendency to be constantly fidgeting or unable to stay still. Individuals with ADHD often exhibit hyperactive behavior, which can manifest as an inability to remain seated, excessive movement, or fidgeting during activities that require stillness. This hyperactivity is one of the core symptoms of the disorder and is observed in various settings, such as at home and in school.

In contrast, the other options do not accurately represent typical characteristics of ADHD. The inability to concentrate can be a symptom, but it is not exclusive to ADHD, as it can also be related to other cognitive or emotional issues. High academic performance is generally not a characteristic of ADHD; individuals with ADHD may struggle academically due to difficulties with attention, organization, and impulsivity. Lastly, always following rules is not a trait associated with ADHD, as individuals with the condition may exhibit impulsive behaviors that can lead to challenges in adhering to structured guidelines.