Hi
The passage says that Viennese audiences were
“ambivalent at best” toward
Don Giovanni. Immediately after, the author explains that the opera
“mixed traditions of moralism with those of comedy,” which was unusual and
“not well-liked by conservative Viennese audiences.” Hence, the mention of mixing traditions serves to explain
why that audience reacted negatively.
(A) is best, while
(B) is incorrect because the phrase about
“mixing traditions of moralism with those of comedy” is not used to summarize or remind readers of the story of the opera.
A plot reminder would describe events or characters in
Don Giovanni-for example, that Don Giovanni is a seducer, commits crimes, or shifts between serious and comic situations. The passage already gives that plot information earlier:
Quote:
“The resulting product was
Don Giovanni, which tells the tale of a criminal and seducer...”
By contrast, the highlighted phrase discusses the
style and structure of the opera-specifically, Mozart’s blending of moral seriousness and comedy. The author mentions this to explain why conservative Viennese audiences disliked the opera.
That’s why
(A) fits the author’s purpose, while
(B) does not.