6869. He is urbane in his manners.

✅ The correct answer is option C.
Urban : in, relating to, or characteristic of a town or city.

Sensible : done or chosen in accordance with wisdom or prudence; likely to be of benefit.

Civil : courteous and polite.

Sane : (of a person) of sound mind; not mad or mentally ill.

Urbane : (of a person, especially a man) courteous and refined in manner.

Synonym of Urbane is Civil