Antonym of IMPROPRIETY

Answer: Option A

Impropriety : failure to observe standards of honesty or modesty; improper behaviour or character.
Decorum : behaviour in keeping with good taste and propriety.
Purity : freedom from adulteration or contamination.
Ideal : satisfying one's conception of what is perfect; most suitable.
Conformity ; compliance with standards, rules, or laws.

Antonym of Impropriety is Decorum