Frank Was Tested by the School Psychologist and Diagnosed with Attention

Frank was tested by the school psychologist and diagnosed with Attention Deficit/Hyperactivity Disorder (ADD/ADHD) .The test results have been explained to his parents.His parents are curious about brain involvement and ADD/ADHD.The school psychologist informs them that

A) hyperactive behaviour is thought to be caused by inefficient brain signals, which can be helped with the use of a stimulant.
B) there is little research to link ADD/ADHD with specific brain involvement.
C) if there is a lag in neural functioning, it will go away with age.
D) ADD/ADHD would be considered a developmental delay.