For the following questions answer them individually
The fuel air ratio in a petrol engine fitted with suction carburetor, operating with dirty air filter as compared to clean filter will be
Which of the following is the lightest and most volatile liquid fuel?
A. $$6 : 1$$Â
B. $$9 : 1$$
C. $$12 : 1$$Â
D. $$15 : 1$$