A Solution, Which Was Made by Dissolving 62

A solution, which was made by dissolving 62.07 g of a nonelectrolyte in 500 g of water, exhibits a freezing point of -1.86°C. What is the molecular weight of this nonelectrolyte compound? For water, K_f is 1.86°C m^-1 and K_b is 0.512°C m^-1.

A) 57.7 g mol^-1
B) 62.07 g mol^-1
C) 115 g mol^-1
D) 124 g mol^-1
E) 231 g mol^-1