Final answer:
Atrial natriuretic peptide (ANP) is the hormone released to decrease blood pressure, it induces vasodilation and diuresis, thus lowering blood volume and pressure.
Step-by-step explanation:
The hormone that is released to decrease blood pressure is atrial natriuretic peptide (ANP), correct option 2. ANP is secreted by cells in the atria of the heart in response to high blood pressure and is a vasodilator that also prevents sodium reabsorption by the renal tubules. This action reduces water reabsorption, encourages diuresis (increased urine production), and suppresses the action of hormones that would otherwise raise blood pressure, like aldosterone, ADH, and renin. By increasing the excretion of both sodium and water by the kidneys, ANP effectively lowers blood volume and, consequently, blood pressure.