c
In aqueous solution \(B A\) (salt) hydrolyses to give

\(B A+H_{2} O \rightleftharpoons B O H+H A\)

Now \(p H\) is given by

\(p H=\frac{1}{2} p K_{w}+\frac{1}{2} p K a-\frac{1}{2} p K_{b}\)

Substituting given values, we get

\(p H=\frac{1}{2}(14+4.80-4.78)=7.01\)