AgCl dissolves in a solution of ${\mathrm{NH}}_3$ but not in water because

The dipole moment of water is higher than ${\mathrm{NH}}_3$

${\mathrm{NH}}_3$ is a stronger base than ${\mathrm{H}}_2\mathrm{O}$

${\mathrm{Ag}}^{+}$ forms a complex ion with $N{H}_3$

${\mathrm{NH}}_3$ is a better solvent than ${\mathrm{H}}_2\mathrm{O}$