Determine the freezing point depression of a solution

Question

Determine the freezing point depression of a solution that contains 30.7 g glycerin (C₃H₈O₃, molar mass = 92.09 g/mol) in 376 mL of water. Some possibly useful constants for water are K_f = 1.86°C/m and K_b = 0.512°C/m.

A) 0.887°C

B) -1.65°C

C) 3.33°C

D) -3.33°C

E) 0.654°C