**Core Concept**
The 3-point relationship, also known as the 3-point hypothesis or the 2:1:1 ratio, is a fundamental concept in the management of hypertension. It refers to the balance between the sympathetic nervous system (SNS) and the renin-angiotensin-aldosterone system (RAAS), as well as the kidneys' role in regulating blood pressure. This delicate balance is crucial in maintaining normotension.

**Why the Correct Answer is Right**
The correct answer is **C.**. In this option, the 3-point relationship is maintained by the concurrent use of a diuretic, an ACE inhibitor, and a calcium channel blocker. This combination allows for a balanced reduction in blood pressure, maintaining the 2:1:1 ratio between the SNS, RAAS, and kidney function. The diuretic helps to reduce fluid volume and cardiac output, while the ACE inhibitor and calcium channel blocker lower blood pressure by reducing vasoconstriction and aldosterone-mediated sodium retention.

**Why Each Wrong Option is Incorrect**
**Option A:** This option does not maintain the 3-point relationship as it involves only two classes of antihypertensive medications. The lack of a diuretic disrupts the balance between the SNS, RAAS, and kidney function.
**Option B:** This option is incorrect as it involves a combination of medications that do not maintain the 3-point relationship. The use of a beta-blocker and a diuretic does not adequately address the RAAS and SNS components.

**Clinical Pearl / High-Yield Fact**
Remember the 3-point relationship as a critical concept in hypertension management. The concurrent use of a diuretic, an ACE inhibitor, and a calcium channel blocker is essential in maintaining the delicate balance between the SNS, RAAS, and kidney function, thereby achieving optimal blood pressure control.

**Correct Answer:** C. This combination of medications maintains the 3-point relationship, ensuring a balanced reduction in blood pressure.