Calculate the cryoscopic constant $(K_f)$ of a solvent if the depression in freezing point of a $0.4 \ m$ solution of a non-volatile solute is $1.8 \ K$.
- A$4.0 \ K \ kg \ mol^{-1}$
- B$4.5 \ K \ kg \ mol^{-1}$
- C$5.1 \ K \ kg \ mol^{-1}$
- D$5.7 \ K \ kg \ mol^{-1}$
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