$\begin {array} {1 1} (A)\;Al_2O_3\: and \: O_2 & \quad (B)\;Al_2O_3\: and \: SO_2 \\ (C)\;Al_2O_3\: and \: SO_3 & \quad (D)\;Al_2O_3S\: and \: O_2 \end {array}$
