Compared with the Brains of People with Average Intelligence, the Brains

Multiple Choice

 Compared with the brains of people with average intelligence, the brains of highly intelligent people

A) do not show any systematic structural differences, because intelligence is determined by environmental factors, not biological factors.
B) show higher volumes of gray matter and cortical thickness in the prefrontal and temporal lobes.
C) show thinner cortical layers.
D) are actually smaller in volume, making them operate more efficiently.