Which combination of reactants will react less than $2\%$ of the theoretically possible extent?

(AC)  

${\mathrm{CH}}_3\mathrm{COOH}\&{\mathrm{NH}}_3$ are weak acid & weak base respectively & ionize in aqueous solution to small extent 
(b) Hydrolysis of $C{H}_{3}CO{O}^{-}$  ion occurs to a small extent
(d) The reaction is acid – base neutralization, which almost goes to completion.