The $\mathrm{pH}$ Of Venous Blood Is Only Slightly More Acidic Than The Than

The $\mathrm{pH}$ of venous blood is only slightly more acidic than the $\mathrm{pH}$ of arterial blood because

A) $\mathrm{CO}_{2}$ is a weak base
B) there is no carbonic anhydrase in venous blood
C) the $\mathrm{H}^{+}$ generated from $\mathrm{CO}_{2}$ and $\mathrm{H}_{2} \mathrm{O}$ is buffered by $\mathrm{HCO}_{3}{ }^{-}$ in venous blood
D) the $\mathrm{H}^{+}$ generated from $\mathrm{CO}_{2}$ and $\mathrm{H}_{2} \mathrm{O}$ is buffered by deoxyhemoglobin in venous blood
E) oxyhemoglobin is a better buffer for $\mathrm{H}^{+}$ than is deoxyhemoglobin