Step 1: Define the given word. 'Urban' relates to a city or town.
Step 2: Define the options. 'Rustic' relates to the countryside, often in a charming or simple way. 'Civil' relates to ordinary citizens. 'Rural' relates to the countryside or areas outside of towns and cities. 'Foreign' relates to another country.
Step 3: Identify the direct opposite. The most direct and common antonym for 'urban' (relating to the city) is 'rural' (relating to the country). 'Rustic' is similar but carries an added connotation of simplicity or charm.