Jennifer Takes Her Daughter, Tabatha, for a Routine Medial Appointment

Jennifer takes her daughter, Tabatha, for a routine medial appointment.The doctor tells Jennifer that Tabatha's brain size is increasing, which is expected because she is under the age of five.What is the cause of Tabatha's brain growth?

A) an increase in number of glial cells
B) increased myelination
C) increases in the size of the cerebellum
D) increases in the size of neural networks