Answer :
Of the four choices above, education most closely relates to domestic policy. Treaties, war, and military issues all normally involve or exist in relation to other nations (foreign) whereas education is an issue handled entirely within one country (domestic).
The correct option is "Education "
Educational law is a branch of public law, which covers a broad legal issue, ranging from the ratification of the fundamental right to education, to the regulation of the National Education System and its components. The educational right ratifies education as a fundamental right (promulgated by the UN), and also regulates the National Educational System, whose main actors are: national education authorities, local education authorities, teachers, students and the community in general who benefits from it.