What Is the Numerical Relationship of Neuroglial Cells Compared to Neurons

What is the numerical relationship of neuroglial cells compared to neurons?

A) Because they are big, one neuroglial cell can serve many neurons, so there are about nine neurons for every neuroglial cell.
B) There are about an equal number of both; each neuron has a companion neuroglial cell.
C) There are about nine neuroglial cells for every neuron.
D) The numbers vary widely from animal to animal and depend on the size of the animal.
E) Brain volume is made of approximately two-thirds neurons and one-third neuroglial cells.