Answer
D
Work Step by Step
Since the same mass of solute will be dissolved in the same mass of solvent, the solution with the lowest freezing point will be the one with the higher number of moles, and consequently, the lower molar mass:
Molar masses:
A: 720.66 g/mol
B: 151.16 g/mol
C: 227.13 g/mol
D: 128.17 g/mol