Final answer:
David's symptoms suggest that he may have Attention Deficit Hyperactivity Disorder (ADHD), a condition characterized by difficulty concentrating, impulsivity, and hyperactivity.
Step-by-step explanation:
David exhibits symptoms that are characteristic of Attention Deficit Hyperactivity Disorder (ADHD), which is a neurodevelopmental disorder. The symptoms that David is showing include being excitable, impulsive, very active, and having great difficulty concentrating. This is indicative of ADHD, a condition affecting approximately three to five percent of children and adults. It is characterized by inattention, executive functioning difficulties, impulsivity, and hyperactivity. Individuals with ADHD often struggle to focus and control their impulses beyond what is typical for their developmental stage. Some may also show comorbid conditions such as depression or obsessive-compulsive disorder (OCD).