The Trend in Local Government Structure Over the Last Sixty

The trend in local government structure over the last sixty years has been

A) relative stability, with the exception of a significant increase in the number of school districts.
B) a slight decrease in the number of counties and towns, an increase in the number of cities, a significant decrease in the number of school districts, and a large increase in the number of special districts.
C) a significant increase in all types of local governments.
D) a decrease in the number of cities and counties, a decrease in the number of towns and townships, but increases in the number of school districts and all other types of special districts.