Most Countries Provide Their Citizens with Free Public Education Until

Most countries provide their citizens with free public education until at least the age of 16 because

A) the supply curve for education does not include all the social benefits of education.
B) a market in equilibrium exploits all the gains achievable from collective action.
C) the demand curve for education does not include all the social benefits of education.
D) educational vouchers that help citizens purchase educational services in the private sector have not proven to increase human capital.
E) direct government control over the standards and quality of education is necessary to increase human capital.