Final answer:
To counter acidosis, the body increases bicarbonate ion (HCO3-) reabsorption by the kidneys, helping to neutralize excess hydrogen ions and raise blood pH. The correct option is c.
Step-by-step explanation:
In the case of acidosis, the body would handle this situation by increasing HCO3- reabsorption. During acidosis, the body aims to raise the blood pH to a normal level. The kidneys respond by reabsorbing more bicarbonate ions (HCO3-) from the urine, which helps neutralize the excess hydrogen ions (H+) in the blood, increasing the pH. This process of bicarbonate reabsorption is part of the body's renal compensation for acidosis. Conversely, decreased HCO3- reabsorption, increased HCO3- secretion, or decreased HCO3- secretion would not be supportive of compensating for acidosis. Therefore, the correct response to acidosis would be to increase HCO3- reabsorption (option c).