The correct answer is (B) respectability; conformity to established standards of good or proper conduct; correctness of manners, behavior, or morals; rightness or appropriateness to the circumstances; suitability to the purpose.

Propriety comes from Middle English propriete, French propriété (property)

Examples of use:

• In the interests of propriety, take her home before midnight.
• If you wish to live here, you will have to observe the proprieties.