When $W_B \ g$ of solute (molecular mass $M_B$) is dissolved in $W_A \ g$ of solvent,the molality $m$ of the solution is:
- A$\frac{W_B}{W_A} \times \frac{M_B}{1000}$
- B$\frac{W_B}{M_B} \times \frac{1000}{W_A}$
- C$\frac{W_A}{W_B} \times \frac{1000}{M_B}$
- D$\frac{W_A \times M_B}{W_B \times 1000}$
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