The correct answer is A. decorum.
Decorum is behavior that is appropriate and respectful in a particular situation. It is often associated with etiquette and manners. Impropriety, on the other hand, is behavior that is not appropriate
or respectful. It can be considered rude, offensive, or even illegal.B. purity is the state of being free from dirt, contamination, or other impurities. It can also refer to the state of being morally or ethically pure. Impropriety is not the opposite of purity.
C. ideal is a standard of perfection or excellence. It can also refer to a person or thing that is considered to be perfect or excellent. Impropriety is not the opposite of ideal.
D. conformity is the act of behaving in a way that is similar to the way that other people behave. It can
also refer to the state of being similar to other people. Impropriety is not the opposite of conformity.