Which of the following reactions does not liberate gaseous product?

Question

$$\begin {array} {1 1} (a)\;AlCl_3+NaOH \longrightarrow & \quad (b)\;NaOH+P(white)+H_2O \longrightarrow \\ (c)\;Al+NaOH \longrightarrow & \quad (d)\;Zn+NaOH \longrightarrow \end {array}$$