Which Set of Arterial Blood Values Describes a Patient with Chronic

Which set of arterial blood values describes a patient with chronic renal failure (eating a normal protein diet) and decreased urinary excretion of $\mathrm{NH}_{4}^{+}$ ?
$\quad \quad \mathrm{pH} \quad \mathrm{HCO}_{3}^{-}(\mathrm{mEq} / \mathrm{L}) \quad \mathrm{PcO}_{2}(\mathrm{~mm} \mathrm{Hg})$

A) $\begin{array}{lll}7.65 & \quad \quad 48 & \quad \quad \quad \quad \quad \quad 45\end{array}$
B) $\begin{array}{lll}7.50 & \quad \quad 15 & \quad \quad \quad \quad \quad \quad 20\end{array}$
C) $\begin{array}{lll}7.40 & \quad \quad 24 & \quad \quad \quad \quad \quad \quad 40\end{array}$
D) $\begin{array}{lll}7.32 & \quad \quad 30 & \quad \quad \quad \quad \quad \quad 60\end{array}$
E) $\begin{array}{lll}7.31 & \quad \quad 16 & \quad \quad \quad \quad \quad \quad 33\end{array}$