**Core Concept**
The elimination of hydrogen ions from the body is a critical process, as it helps maintain acid-base balance and prevent acidosis. This process involves the buffering of excess hydrogen ions by various mechanisms, ultimately leading to their excretion.

**Why the Correct Answer is Right**
The primary mechanism of hydrogen ion elimination is through the kidneys, where they are excreted in the urine as ammonium ions (NH4+) or bicarbonate ions (HCO3-). The kidneys play a crucial role in maintaining acid-base balance by adjusting the excretion of hydrogen ions based on the body's needs. This is made possible by the action of enzymes such as carbonic anhydrase, which catalyzes the conversion of carbon dioxide and water to bicarbonate and protons.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately describe the primary mechanism of hydrogen ion elimination.
**Option B:** This option is incorrect as it is not a recognized mechanism of hydrogen ion elimination in the human body.
**Option C:** This option is incorrect as it refers to a different process altogether, unrelated to hydrogen ion elimination.

**Clinical Pearl / High-Yield Fact**
It is essential to note that the kidneys play a critical role in maintaining acid-base balance, and any impairment in renal function can lead to acidosis. The kidneys can compensate for some degree of acidosis, but severe impairment can result in life-threatening consequences.

**Correct Answer:** C. The kidneys.