Final answer:
The primary source of revenue for counties in Texas is Property Tax, which is essential for funding local services such as public schools and emergency services. Property taxes account for about 72 percent of local government tax revenue in Texas.
Step-by-step explanation:
The primary source of revenue for counties in Texas is c) Property Tax. In Texas, property tax plays a crucial role in local government finance. Unlike many states, Texas does not levy a state income tax on individuals. Instead, it relies more heavily on property taxes to fund local services such as public schools, road maintenance, and emergency services. According to the data provided, for local governments, the property tax was the most important source of tax revenue, accounting for about 72 percent of the total. This indicates that property taxes are vital for the operation and maintenance of essential services at the local level in Texas.