If vapour pressures of pure liquids $A$ and $B$ are $300$ and $800 \, torr$ respectively at $25 \, ^{\circ}C$. When these two liquids are mixed at this temperature to form a solution in which mole percentage of $B$ is $92$,then the total vapour pressure is observed to be $0.95 \, atm$. Which of the following is true for this solution?

• A
  $\Delta V_{mix} > 0$
• B
  $\Delta H_{mix} < 0$
• C
  $\Delta V_{mix} = 0$
• D
  $\Delta H_{mix} = 0$