Toby is three years old. His parents are concerned because he is always running and jumping around. He cannot seem to sit still. Even when watching his favorite movie on TV, he fidgets and wiggles. It is especially frustrating for his parents when Toby does not sit still through dinner. Which of the following should Toby's parents do?A. They should have him tested for attention deficit disorder.B. They should start him on a behavior modification program.C. They should provide structured, cognitively challenging activities for Toby to develop his attention span.D. They should treat this behavior as normal and avoid being panicked, as Toby's behavior is normal for kids in his age group.