Calculate the cryoscopic constant $(K_f)$ when $0.8 \ g$ of a non-volatile solute with a molar mass of $64 \ g \ mol^{-1}$ is dissolved in $43 \ g$ of a solvent,lowering the freezing point by $0.34 \ K$.
- A$2.5 \ K \ kg \ mol^{-1}$
- B$2.0 \ K \ kg \ mol^{-1}$
- C$0.85 \ K \ kg \ mol^{-1}$
- D$1.17 \ K \ kg \ mol^{-1}$
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