The correct option is A Insulin
Insulin is a peptide hormone which is synthesized and released by the pancreas. It plays a major role in the regulation of the level of glucose in blood. Insulin decreases the blood glucose levels. It also stimulates the conversion of glucose to glycogen (glycogenesis) in the target cells.
Glucagon has effects opposite to those of insulin. For example, it promotes glycogenolysis, the breaking down of glycogen to glucose.
Adrenaline and noradrenaline are rapidly secreted by the adrenal medulla in response to emergency situations.
Aldosterone is a mineralocorticoid hormone produced by the adrenal cortex. It helps in the maintenance of the balance of water and electrolytes in the body.