Which of the Following Statements Regarding Control of Respiration Is

Which of the following statements regarding control of respiration is correct?

A) A slight decrease in arterial PO₂ is a stronger stimulus for increased ventilation than is a comparable decrease in arterial PCO₂.
B) The most important signal for regulating ventilation is the H⁺ concentration of arterial blood.
C) Increased concentrations of lactic acid stimulate ventilation primarily by acting on peripheral chemoreceptors.
D) An increase in the HCO₃⁻ concentration in blood stimulates ventilation.
E) At high altitude,a decrease in PCO₂ of the blood stimulates an increase in ventilation.