Respuesta :

Answer: The answer is potassium. Its the major ion  in the intracellular region.

Explanation: Extracellulary, Sodium is major ion. Intracellular concentration of sodium is: 12 mEq/L Extracellular concentration of sodium is: 140 mEq/L Intracellularly, Potassium is major ion.

The correct answer is: D. sodium