A 0230 M Solution of an Unknown Electrolyte Depresses the Freezing

A 0.230 m solution of an unknown electrolyte depresses the freezing point of water by 0.821°C.What is the Van't Hoff factor for this electrolyte? The freezing point depression constant for water is 1.86°C/m.

A) 0.521
B) 1.92
C) 2.00
D) 2.30
E) 4.41