OE

A, B

The celebrity in the sentence has done something “vociferously.” “Vociferously” means “clamorously” and describes speech, so you know she spoke ardently and loudly. She must also have been trying to convince her audience of something, since her action is contrasted with being ignored. A good prediction is lectured or orated. When you look at the answer choices, there’s nothing that precisely matches your prediction, but (A) inveighed and (B) declaimed come close. Both have a connotation of oratory, typically arguing against something. That harmonizes very well with “vociferously.” Choices (C) conceded, “gave in,” (E) abstained, “declined to participate,” and (F) acceded, “agreed,” can all be rejected as being too passive and therefore opposite to what you need. Choice (D) demurred, “raised an objection,” is wrong because it isn’t strong enough.