Toluence, `C_7H_8` is added to gasoline to increase its octane rating. What is the volume ratio of air to tolane vapour to burn completely to from `CO_2` and `H_2O`? (Assume air is 20% `O_2` by volume.)
A. `(9)/(1)`
B. `(11)/(1)`
C. `(28)/(1)`
D. `(45)/(1)`
