If a $0.4 \text{ molal}$ solution of a nonvolatile solute in an organic solvent decreases its freezing point by $2.4 \text{ K}$, then the molal depression constant $(K_f)$ of the solvent will be:
- A$3.0 \text{ K kg mol}^{-1}$
- B$4.0 \text{ K kg mol}^{-1}$
- C$5.0 \text{ K kg mol}^{-1}$
- D$6.0 \text{ K kg mol}^{-1}$
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