Final answer:
The sisters choose not to expose Wickham to avoid causing a scandal in the town, reflecting the importance of maintaining social decorum during the Regency era.
Step-by-step explanation:
The sisters decide to keep the information about Wickham's true character to themselves because B) They fear causing a scandal in the town.
By revealing Wickham's true nature, they risk igniting a scandal that could reflect poorly on their own family's reputation and disrupt the social harmony of their community. Their choice reflects the societal norms and expectations of discretion and propriety during the Regency era, where public perception was of critical importance.