What Is the Function of Carbonic Anhydrase

What is the function of carbonic anhydrase?

A) to speed up the rate at which CO₂ binds to hemoglobin
B) to speed up the rate at which CO₂ binds to O₂
C) to speed up the conversion of CO₂ and H₂O into HCO₃^- and H⁺
D) to speed up the conversion of HCO₃^- and O^- into CO₂ and H₂O