In Children of Average Intelligence,the Prefrontal Cortex Is Relatively Thick

Multiple Choice

In children of average intelligence,the prefrontal cortex is relatively thick at age 7,and then

A) peaks in thickness by age 12 for all children regardless of intelligence.
B) peaks in thickness at about age 8 for typical children but peaks at 11 to 12 years for highly intelligent children.
C) remains the same over the middle childhood period, as it was when the child was younger.
D) gradually increases in thickness as brain connections are increased.