Final answer:
The best replacement for 'propriety' in the provided context is 'respectability', as it captures the notion of being in line with social norms and decency. Option 3: Respectability. is the correct answer.
Step-by-step explanation:
The word that best replaces propriety in the context of the passage provided is respectability. Propriety in this sense refers to behavior that is considered to be socially acceptable, proper, or in accordance with conventional standards of decorum. Out of the options given, respectability aligns most closely with this meaning, as it denotes qualities or behaviors that are respectable, decent, and in line with societal norms and expectations.
Anxiety refers to a feeling of worry, nervousness, or unease, which does not match the given definition of propriety. Arrogance is the quality of being overly confident or proud in an offensive manner, which again diverges from the meaning of propriety.
Lastly, indecent points to behavior that is not suitable or proper, thus being the antonym of propriety rather than a synonym.
Considering this analysis, the correct option to replace 'propriety' is Option 3: Respectability.