这部小说以贾宝玉和林黛玉的爱情悲剧为线索，描写了封建官僚四大家族的衰落过程。 A: With the tragic love story of Jia Baoyu and Lin Daiyu as the main theme, the novel describes the decline of four feudal noble families. B: The novel has Jia Baoyu and Lin Daiyu's tragic love story as its theme, describes the feudal noble families' decline. C: / D: /