Right choice is (b) Petrol
To explain I would say: Petrol has the lightest liquid petroleum fraction and highly volatile in nature. It is also called gasoline. It has a specific gravity ranging from 0.70 to 0.78. It is obtained between 65 to 200^oC and it is a mixture of a number of hydrocarbons. It is light yellow in color and it is used as a fuel in automobiles and aero planes.