Executive function is the mental skill of your brain to pay attention on the task at hand, plan and organize things, control yourself of bad behavior and multitask. The active part of your brain controlling this is the frontal lobe. It basically consist of two groups: the organizational skill and the regulation skill. Together, they keep your thoughts in the right order and avoid behaving inappropriately in public. Persons with weak executive functions are those with ADHD, autistic and patients with Alzheimer's disease.
From these descriptions, the scenarios that exhibit a good executive function is: Denzel concentrates on his reading in class while ignoring all distractions.
