The molal depression constant for water is $1.86 \, ^\circ C \, kg \, mol^{-1}$. The freezing point of a $0.05 \, m$ solution of a non-electrolyte in water is:
- A$-1.86 \, ^\circ C$
- B$-0.93 \, ^\circ C$
- C$-0.093 \, ^\circ C$
- D$0.93 \, ^\circ C$
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