Calculate the cryoscopic constant $(K_f)$ of a solvent if the depression in freezing point of a $0.18 \ m$ solution of a non-volatile solute is $0.2 \ K$.
- A$1.73 \ K \ kg \ mol^{-1}$
- B$1.50 \ K \ kg \ mol^{-1}$
- C$1.11 \ K \ kg \ mol^{-1}$
- D$1.92 \ K \ kg \ mol^{-1}$
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