The Freezing Point of a 0 $\circ$ CWhat Is the Actual Van 'T Hoff Factor for This

The freezing point of a 0.0925 m solution of ammonium chloride was found to be -0.325 ^$\circ$ C.What is the actual van 't Hoff factor for this salt at this concentration compared to the ideal one of 2? [K_f (water) = 1.86 ^$\circ$ C/m]

A) 1.89
B) 1.95
C) 1.90
D) 1.80
E) 1.97