Which one of the following esters gets hydrolyzed most easily under alkaline conditions?

Alkaline hydrolysis of esters involves nucleophilic attack by ${\text{OH}}^{-}$ on the carbonyl carbon. Electron-withdrawing groups (EWG) like $-{\text{NO}}_2$ increase the positive charge on the carbonyl carbon, making it more susceptible to nucleophilic attack. Therefore, the $p$ -nitro ester hydrolyzes most easily.