A metal (X) dissolves both in dilute HCl and dilute NaOH to liberate H2. Addition of NH4Cl and excess NH4OH to an HCl solution of X produces Y as a precipitate. Y is also produced by adding NH4Cl to the NaOH solution of X. The species X and Y, respectively, are
(A) Zn and Zn(OH)2
(B) Al and Al(OH)3
(C) Zn and Na2ZnO2
(D) Al and NaAlO2
