Lyle,age 10,sometimes Forgets About Homework He's Been Assigned or Underestimates

Lyle,age 10,sometimes forgets about homework he's been assigned or underestimates how long it will take him to complete it and doesn't finish it in time.In class,sometimes he finds himself daydreaming,and one time he even forgot that he had to present his science project that day,so he left it at home,even though it was completed.Which of the following is NOT true of Lyle?

A) He can't have ADHD because he's too young to be diagnosed.
B) We don't know how long these symptoms have lasted, so he can't be diagnosed with ADHD unless they last 6 months or more.
C) We've only really seen problems related to Lyle's school performance; people with ADHD have problems in multiple settings.
D) It doesn't seem that Lyle's symptoms are inconsistent with his developmental level or greatly exceed those shown by other kids his age.