Right option is (d) 1.95 M
Explanation: The reaction C2H5COOC2H5 + H2O → C2H5COOH + C2H5OH is a pseudo first order reaction and follows first order kinetics with rate law R=k[C2H5COOC2H5].
Given, rate of the reaction R=0.39 s^-1 and rate constant k=0.2
So, 0.39 = 0.2 × [C2H5COOC2H5]
[C2H5COOC2H5]=1.95 M.