Is It Easy or Difficult for Parents to Diagnose Probable

Is it easy or difficult for parents to diagnose probable ADHD, and why?

A) It is easy because the symptoms are so obvious and pronounced.
B) It is easy to diagnose the hyperactivity component, but not the inattentive component, since the latter might be simply mistaken for quiet, obedient behavior.
C) It is easy to diagnose the inattentive component, but not the hyperactive component, because the hyperactivity is mistaken for lack of obedience on the child's part.
D) Both the attention-deficit and hyperactivity associated with ADHD are often mistaken for other behavior problems.