A Partial Explanation of the Change in Public-Sector Employment Since

A partial explanation of the change in public-sector employment since 1950 is that:

A) the demand for public-sector goods is price elastic-as their relative prices have fallen,more public goods have been demanded.
B) the number or school-age children has declined which in turn has caused a marked decrease in the demand for public school teachers
C) the demand for public-sector goods is income elastic-as society's real income has grown,more public goods have been demanded
D) the federal government has been running larger budget deficits