Ammonium chloride is added in small portions to a blue solution of sodium in liquid ammonia. What is observed, and what are the products?

1. AThe blue colour is discharged and $\mathrm{Cl}{}_2$ is evolved.
2. BThe blue colour is discharged and $\mathrm{H}{}_2$ is evolved; $\mathrm{NaCl}$ and $\mathrm{NH}{}_3$ are formed.
3. CThe solution turns bronze and $\mathrm{NaNH}{}_2$ precipitates.
4. DThe blue colour deepens and $\mathrm{N}{}_2$ is evolved.