The correct answer is polite behaviour.
Decorum
A. adornment
B. fashion
C. polite behaviour
D. ritual
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.