The correct option is B rudeness
Suavity means a man's behaviour that is polite, pleasant, and usually attractive, but often slightly false. The opposite of suavity is rudeness, or lack of manners; discourteousness. Hence, Option B is correct. Among the rest of the options, politeness means behaviour that is respectful and considerate of other people, stupidity means behaviour that shows a lack of good sense or judgement, pleasant means giving a sense of happy satisfaction or enjoyment. These options do not express this antonym, hence incorrect.