Of the following 1.1 m aqueous solutions which one will be exhibit the largest freezing point depression

Van’t Hoff factor of ${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3$ is maximum, i.e. = 5
Thus, ${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3$  will exhibit largest freezing point depression