$Y \ g$ of non-volatile organic substance of molecular mass $M$ is dissolved in $250 \ g$ benzene. The molal elevation constant of benzene is $K_b$. The elevation in its boiling point is given by:
- A$\frac{M}{K_b Y}$
- B$\frac{4 K_b Y}{M}$
- C$\frac{K_b Y}{4 M}$
- D$\frac{K_b Y}{M}$
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