$X$ is a non-volatile solute and $Y$ is a volatile solvent. The following vapour pressures are observed by dissolving $X$ in $Y$ at different concentrations:
| $X / \text{mol L}^{-1}$ | $Y / \text{mm of Hg}$ |
| :--- | :--- |
| $0.10$ | $p_1$ |
| $0.25$ | $p_2$ |
| $0.01$ | $p_3$ |
The correct order of vapour pressures is:

• A
  $p_1 < p_2 < p_3$
• B
  $p_3 < p_2 < p_1$
• C
  $p_3 < p_1 < p_2$
• D
  $p_2 < p_1 < p_3$