Synonym of CIVIL

Answer: Option D

Sophisticated : having, revealing, or involving a great deal of worldly experience and knowledge of fashion and culture.
Social : relating to society or its organization.
Formal : done in accordance with convention or etiquette; suitable for or constituting an official or important occasion.
Polite : having or showing behaviour that is respectful and considerate of other people.
Civil : courteous and polite.

Synonym of Civil is Polite