Which of the following statements is true about the biological factors associated with attention-deficit/hyperactivity disorder (ADHD) ?

A) The prefrontal cortex, which regulates attention, organization, and planning, is larger in volume in children with ADHD and shows abnormal activation.
B) The catecholamine neurotransmitters, which include dopamine, serotonin, and norepinephrine, appear to function abnormally in individuals with ADHD.
C) The notion that hyperactivity in children is caused by dietary factors has been substantiated in controlled studies.
D) ADHD is largely associated with high birth weight.