Which mixture can be separated by a concentrated aqueous solution of sodium hydroxide $(NaOH)$?

• A
  $Al^{3+}$ and $Sn^{2+}$
• B
  $Al^{3+}$ and $Fe^{3+}$
• C
  $Al^{3+}$ and $Zn^{2+}$
• D
  $Zn^{2+}$ and $Pb^{2+}$