What are the main sources of revenue for local governments?
a. state grants
b. federal grants
c. income tax
d. property taxes

The correct option is D

Explanation:

Local government is the one whose main function is to administer the state laws locally, which means that the counties have the vital and main responsibilities as well as power in the administration of the specific geographic area without able to make or create the rules which will certain to that specific area. The major source of the local government for collecting the revenue is the property taxes.

Answer is D.  Property taxes

Explanation:

The local government taxes a majority of property taxes and spends it on schools. This is why places with lower property taxes have poor education systems, but those with high property taxes have good education systems.

answer(b); ; ; the quantitative or qualitative variable for which the experimenter wishes to determine how its value is affected by the explanatory variable;