The correct answer is polite behaviour.
C. polite behaviour
The correct answer is (C) polite behavior, dignified propriety of behavior, speech, dress, etc. Seemliness, etiquette; politeness. Conformity to conventional social manners in speech, dress, behavior, and writing.
Decorum comes from Latin decorum (fitting).
Examples of use:
- In his business, he felt that it was important to retain a measure of decorem.
- His decorem and respectfulness was appreciated by his grieving customers.