The correct option is C Electrolyte
The potential difference in a source of electricity such as simple voltaic cell is defined in terms of Electrolyte. Electrolyte a liquid or gel which contains ions and can be decomposed by electrolysis, e.g. that present in a battery.A balance of different electrolytes is vital for healthy function. Fast facts on electrolytes. Electrolytes are vital for the normal functioning of the human body. Fruits and vegetables are good sources of electrolytes. Common electrolytes include sodium, potassium, calcium and bicarbonate.