Calculate the molality of a solution of a non-volatile solute having a depression in freezing point of $0.93 \ K$ and a cryoscopic constant of the solvent of $1.86 \ K \ kg \ mol^{-1}$.
- A$0.3 \ mol \ kg^{-1}$
- B$0.4 \ mol \ kg^{-1}$
- C$0.5 \ mol \ kg^{-1}$
- D$0.6 \ mol \ kg^{-1}$
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