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 P_O2 is a stronger stimulus for increased ventilation than is a comparable decrease in arterial P_CO2.
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 P_CO2 of the blood stimulates an increase in ventilation.