Body Sodium Levels Help to Maintain Fluid and Electrolyte Balance

Body sodium levels help to maintain fluid and electrolyte balance and  are largely regulated through:

A) changes in intestinal absorption, depending on need.
B) changes in fecal excretion.
C) storage of excess sodium in the liver.
D) excretion of excess potassium by the kidneys.
E) excretion of excess sodium by the kidneys.