The correct option is B Limit the use of fuel
Fuels are available in a limited quantity. Therefore, to make sure that they do not exhaust easily, we can limit their usage. This can be done by using cycles as a mean of transportation or using carpools so that the fuel is not wasted.
Firewood and coal are fuels that are not renewable and by using them regularly, they will exhaust very quickly. Also, reducing the manufacture of cars will not help in saving fuel.