(A) conjugate base is formed by the removal of a proton $(H^{+})$ from the given acid.For the species $HPO_4^{2-}$,removing one $H^{+}$ ion results in

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(A) conjugate base is formed by the removal of a proton $(H^{+})$ from the given acid.For the species $HPO_4^{2-}$,removing one $H^{+}$ ion results in the formation of $PO_4^{3-}$.The reaction is: $HPO_4^{2-} \rightarrow H^{+} + PO_4^{3-}$.Therefore,the conjugate base of $HPO_4^{2-}$ is $PO_4^{3-}$.