A physician prescribes a drug that selectively blocks beta-1 adrenergic receptors. At therapeutic doses, which of the following effects would be most prominent?

✓ Correct Answer: Option C

Beta-1 adrenergic receptors are predominantly found in the heart (increasing rate/contractility) and renal juxtaglomerular cells (increasing renin release). Blocking these receptors decreases both heart activity and renin release, making 'decreased renin release' a prominent effect.