Final answer:
Elizabeth fears that Darcy will view her family as socially unacceptable due to Lydia's scandal, affecting her own prospects of marrying him.
Step-by-step explanation:
Elizabeth believes that Darcy will never want to marry her because B) she believes Darcy will view her family as socially unacceptable. This assumption is rooted in the social norms and expectations of the period, where family connections and social standing were significant factors in marriage considerations. Despite Darcy's previous proposal and his clear affection for Elizabeth, she fears that the scandal and impropriety surrounding her younger sister Lydia's elopement and hasty marriage will taint her own reputation and make her family undesirable in the eyes of someone of Darcy's social position.