He is urbane in his manners.

The correct answer is C. civil.

Urbane means polite and sophisticated, especially in a way that is characteristic of a city.

Sensible means having or showing good sense; practical and realistic.

Civil means polite and respectful in behavior.

Sane means having a sound mind; mentally healthy.

In the context of the question, the man is described as being urbane in his manners. This means that he is polite and sophisticated, especially in a way that is characteristic of a city. The other options are not as relevant to the question.