The correct option is (c) Pro-diuretic hormone
Easiest explanation: The re-absorption is partly an automatic process because the absorption of water is accurately controlled by the anti-diuretic hormone of the pituitary gland, in relation to the body’s need for water. The absorption of electrolytes such as sodium and potassium is partly controlled by the supra-renal gland and the concentration of others, like chloride and bicarbonate, is related to the acid-base balance.