Which sentence uses an adverbial clause to add variety and interest to its meaning? A) No one knew what the theme of the dancing contest for next year would be. B) The emcee, along with the school principal, announced the theme for next year's dancing contest. C) After all the confetti had fallen, the emcee announced the theme for next year's dancing contest. D) The contestants in the dancing contest listened to the announcement of next year's theme.