$2.0 \ g$ of a non-electrolyte dissolved in $100 \ g$ of benzene lowers the freezing point of benzene by $1.2 \ K$. The freezing point depression constant of benzene is $5.12 \ K \ kg \ mol^{-1}$. The molar mass of the solute is:
- A$55 \ g \ mol^{-1}$
- B$85 \ g \ mol^{-1}$
- C$120 \ g \ mol^{-1}$
- D$155 \ g \ mol^{-1}$
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