The correct option is A vasopressin
Antidiuretic hormone (vasopressin) is released by the posterior pituitary lobe when the blood has high osmolarity (number of solute particles per litre of solution).
When the blood volume and blood pressure decrease, juxtaglomerular cells in the kidneys secrete the enzyme renin. Renin catalyzes the conversion of angiotensinogen to angiotensin II.
Rennin is secreted by gastric glands of the stomach. It is helpful in the digestion of milk protein casein.