Which of the following would be the best partner to react wi…

Which оf the fоllоwing would be the best pаrtner to reаct with ethyl аcetate (CH3CO2Et) in a crossed-Claisen condensation reaction?   ©GMU@X@user.pk_string@X@ ©GMU@X@user.pk_string@X@ ©GMU@X@user.pk_string@X@ ©GMU@X@user.pk_string@X@ ©GMU@X@user.pk_string@X@ ©GMU@X@user.pk_string@X@ ©GMU@X@user.pk_string@X@ ©GMU@X@user.pk_string@X@ ©GMU@X@user.pk_string@X@