**Core Concept**
The underlying principle being tested is the regulation of acid-base balance in the body, specifically the mechanism by which **hydroxyl ions (OH-)** are managed to maintain **pH homeostasis**. This involves various chemical reactions and buffering systems.

**Why the Correct Answer is Right**
Hydroxyl ions are destroyed in the body through a reaction with **hydrogen ions (H+)** to form **water (H2O)**. This process is crucial for maintaining the body's acid-base balance. The correct answer involves the reaction of hydroxyl ions with carbon dioxide (**CO2**) in the presence of the enzyme **carbonic anhydrase**, producing **bicarbonate (HCO3-)** and water.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the primary mechanism by which hydroxyl ions are destroyed in the body.
**Option B:** This option is also incorrect as it does not involve the correct biochemical pathway for hydroxyl ion destruction.
**Option C:** Similarly, this option does not accurately represent the process by which hydroxyl ions are managed in the body.

**Clinical Pearl / High-Yield Fact**
Remember that the balance between hydrogen and hydroxyl ions is critical for maintaining proper **pH levels** in the body. An imbalance can lead to conditions such as **acidosis** or **alkalosis**, which have significant clinical implications.

**Correct Answer:** D. Carbonic acid formation and then to water and carbon dioxide.