Answer:
D. provide driver's licenses.
The idea web is focused on the role of the Louisiana State Government, which includes collecting taxes, providing resources to schools, and fulfilling other functions that are essential to the functioning of the state. Of the options provided, only providing driver's licenses is directly related to the role of the state government, as this is a service that is typically provided by state departments of motor vehicles. Delivering the mail, electing mayors of cities, and selling gasoline to citizens are not functions that are typically performed by state governments.