Which of the following statements about the composition of the vapour over an ideal $1:1$ molar mixture of benzene and toluene is correct? Assume that the temperature is constant at $25^{\circ }\text{C}$. (Given vapour pressure data at $25^{\circ }\text{C}$: benzene $=12.8\text{kPa}$, toluene $=3.85\text{kPa}$)

1. A
   The vapour will contain a higher percentage of toluene.
2. B
   The vapour will contain equal amounts of benzene and toluene.
3. C
   Not enough information is given to make a prediction.
4. D
   The vapour will contain a higher percentage of benzene.