All of the following statements regarding the pathophysiology of attention - deficit / hyperactivity disorder ( ADHD ) are correct except
a. Hippocampal volume is increased bilaterally in a large sample of children with ADHD relative to control subjects .
b. The parents of ADHD children ( who had ADHD themselves ) show decreased activity in the fronto- striatal areas and anterior cingulate cortex ( ACC ) .
c. Compared with children with ADHD , control subjects have increased activation in the prefrontal cortex ( PFC ) bilaterally when performing response inhibition tasks .
d. Children with ADHD show larger volumes of the dorsolateral prefrontal cortex ( DLPFC ) , anterior cingulate , and caudate regions compared with control subjects .