With Regard to the Onset of Symptoms of ADHD, ____

 With regard to the onset of symptoms of ADHD, ____.

A) symptoms of hyperactivity-impulsivity and inattention tend to emerge at about the same time, usually in the preschool years
B) symptoms of hyperactivity-impulsivity and inattention tend to emerge at about the same time, usually in the early primary school years
C) symptoms of inattention usually emerge before symptoms of hyperactivity-impulsivity
D) symptoms of hyperactivity-impulsivity usually decline by adolescence