How Would the Kidneys Respond to Hypoventilation

How would the kidneys respond to hypoventilation?

A) Increasing secretion of H⁺ and increasing production of new HCO₃⁻
B) Increasing secretion of H⁺ and decreasing reabsorption of HCO₃⁻
C) Decreasing secretion of H⁺ and increasing production of new HCO₃⁻
D) Decreasing secretion of H⁺ and decreasing reabsorption of HCO₃⁻
E) Increasing excretion of CO₂