**Core Concept**
Membrane stabilizing activity, also known as quinidine-like or local anesthetic action, is a property of certain beta-blockers that contribute to their antiarrhythmic effects by stabilizing neuronal and cardiac membranes. This effect is distinct from beta-blockade and is often seen in non-selective beta-blockers.

**Why the Correct Answer is Right**
Oxprenolol is a non-selective beta-blocker with membrane stabilizing activity, which is a result of its ability to block sodium channels in the cardiac cell membrane. This action contributes to its antiarrhythmic effects, particularly in treating supraventricular tachycardia. Oxprenolol's membrane stabilizing activity is thought to involve its lipophilic properties, which allow it to penetrate the cell membrane and interact with sodium channels. This property is not seen to the same extent in other beta-blockers listed here.

**Why Each Wrong Option is Incorrect**
**Option A:** Nadolol is a non-selective beta-blocker, but it does not have significant membrane stabilizing activity. Its long duration of action and high lipid solubility make it more suited for once-daily dosing.
**Option B:** Atenolol is a selective beta-1 blocker with minimal membrane stabilizing activity. It is primarily used for the treatment of hypertension and angina.
**Option C:** Carvedilol is a non-selective beta-blocker with additional alpha-1 blocking activity, but it does not have significant membrane stabilizing activity. Its unique pharmacological profile makes it useful for treating heart failure.

**Clinical Pearl / High-Yield Fact**
When choosing a beta-blocker for antiarrhythmic therapy, clinicians should consider the presence of membrane stabilizing activity, as it can impact the drug's efficacy and potential for side effects.

**✓ Correct Answer: D. Oxprenolol**