Which of the following substitutions can reduce air pollution?

a.) using a bike instead of a car
b.) using dumps instead of landfills
c.) using coal instead of oil
d.) using fireplaces instead of a wind farms

Among the choices given, only the first choice, "A. using a bike instead of a car", can help reduce air pollution. This is because a great percentage of the total air pollution is attributed to the emissions from the cars and other vehicles. 

The answer is texture