The $p^{Ka}$ of a weak acid $HA$ is $4.80$ The $pK_b$ of a weak base BOH is $4.78$ .The $p^{H}$ of an aqueous solution of the corrosponding salt $BA$ will be
$\begin{array}{1 1} (a)\;9.58 \\ (b)\;4.79 \\ (c)\;7.01 \\(d)\;9.22\end{array}$