The correct option is C military
Civil means relating to ordinary citizens and their concerns, as distinct from military or ecclesiastical matters. The opposite of civil is military, or relating to or characteristic of soldiers or armed forces. Hence, Option C is correct. Among the rest of the options, political means relating to the government or public affairs of a country, urban means in, relating to, or characteristic of a town or city, rural means in, relating to, or characteristic of a town or city. These options do not express the intended antonym, hence incorrect.