The correct answer is: A. politeness.
Suavity is a quality of being smooth, suave, and ingratiating. It is often used to describe someone who is very polite and charming. In the context of the question, Dev’s deliberate suavity of behaviour made the emotions of the audience volatile because it was seen as being insincere and manipulative. The audience felt that Dev was trying to control them with his charm, and this made them angry and resentful.
B. Impetuosity is a quality of being rash, impulsive, and quick to act without thinking. This is not the correct answer because Dev’s behaviour was not impulsive or rash. He was very deliberate in his actions, and he knew exactly what he was doing.
C. Stupidity is a quality of being foolish, unintelligent, and lacking in common sense. This is not the correct answer because Dev was not stupid. He was very intelligent and cunning.
D. Pleasant is a quality of being agreeable, enjoyable, and pleasing. This is not the correct answer because Dev’s behaviour was not pleasant. It was seen as being insincere and manipulative.