According to the Focus on Neuroscience Box on the Adolescent

According to the Focus on Neuroscience box on the adolescent brain, research has shown that the developing brain experiences two distinct spurts of brain development. When do these spurts take place?

A) during prenatal development and just before the beginning of puberty
B) during the first year of life and again at age five
C) on the average, at age five and again at age 15
D) at age two, when language development dramatically accelerates, and at age 13 to 14, after the adolescent growth spurt