The correct answer is uncompensated respiratory acidosis.
This is a condition in which decreased ventilation (hypoventilation) increases the concentration of carbon dioxide (CO2) in the blood which causes the pH of blood and to decrease (becomes acidic. Acidosis occurs because restoration of normal acid-base balance is not possible or has not yet been achieved. Uncompensated acidosis is characterized by abnormal pH and abnormal values of PaCO2 or HCO3.