Hyponatremia Translates to Low Sodium in the Blood

Multiple Choice

Hyponatremia translates to low sodium in the blood.This is a concern for marathon runners who drink too much water,and can cause life-threatening pressure on the brain.Why would this occur?

A) Neurons would take up the sodium from the blood and not be able to polarize
B) Neurons would be stimulated to all fire at once
C) Neurons would swell by osmosis
D) Neurons die in low levels of sodium
E) Neurons cannot give the kidneys signals to reabsorb sodium ions