A. Metabolic acidosis: This occurs due to an accumulation of acids or loss of bicarbonate, often from kidney dysfunction or toxins. It’s unrelated to the lungs' inability to eliminate CO2, which leads to respiratory, not metabolic, imbalances. B. Metabolic alkalosis: This results from excess bicarbonate, often due to vomiting or diuretics. It’s not caused by the lungs failing to eliminate CO2, which would affect the respiratory balance. C. Respiratory acidosis: This condition develops when the lungs cannot eliminate enough CO2, leading to an increase in carbonic acid and a decrease in blood pH. It's common in respiratory failure or COPD, where ventilation is impaired. D. Respiratory alkalosis: This occurs when CO2 is excessively removed, often due to hyperventilation. It leads to alkalosis, but CO2 retention from lung failure causes acidosis, not alkalosis.