What Happens to the Brain During the First Adolescent Growth

What happens to the brain during the first adolescent growth spurt, between 13 and 15 years?

A) The prefrontal cortex and the frontal lobe expands
B) The prefrontal cortex matures and the neurons in the prefrontal cortex form new synapses with those in other parts of the brain
C) The cerebral cortex becomes thicker and the neuronal pathways become more efficient
D) The brain virtually shuts down allowing the body to focus on rapid physical growth.