Which of the following is a key feature of Attention-Deficit/Hyperactivity Disorder (ADHD)?

Inattention and hyperactivity are hallmark characteristics of Attention-Deficit/Hyperactivity Disorder (ADHD). Individuals with ADHD often struggle with sustaining attention, which impacts their ability to focus on tasks, follow through on assignments, and listen to instructions. This inattention can manifest in various ways, such as making careless mistakes, being easily distracted, or having difficulty organizing tasks and activities.

Additionally, hyperactivity is another critical component of ADHD. Individuals may exhibit excessive fidgeting, restlessness, and an inability to stay seated in situations where it's expected. This blend of inattention and hyperactivity can significantly impair functioning in academic, occupational, or social settings.

Other options do not align with the defining features of ADHD. For instance, an excessive focus on details typically corresponds to conditions like obsessive-compulsive disorder rather than ADHD. Difficulty in adapting to change may be observed in various contexts but is not exclusive to ADHD. Similarly, consistent mood regulation does not characterize ADHD, which is more about attention control and activity levels rather than emotional stability.