If $P_0$ and $P_s$ are the vapour pressures of the solvent and its solution respectively,and $N_1$ and $N_2$ are the mole fractions of the solvent and solute respectively,then which of the following is correct?
- A$P_s = \frac{P_0}{N_2}$
- B$P_0 - P_s = P_0N_2$
- C$P_s = P_0N_2$
- D$\frac{P_0 - P_s}{P_s} = \frac{N_1}{N_1 + N_2}$
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