OE
The sentence indicates that there wasn’t a single positive comment from any critic; in other words, the film was unanimously criticized or 100% disliked. “Mendaciously” means dishonestly, and there’s no clue to indicate that the critics were being dishonest. Similarly, there’s no clue in the sentence to suggest that anyone was “warily” suggesting anything. “Roundly” means emphatically or so thoroughly as to leave no doubt. “Panned” means reviewed negatively and is almost always used to refer to plays, movies, etc., so the word is a perfect match here—to be roundly panned would mean reviewed 100% negatively, which is exactly what the sentence suggests. “Lauded” and “venerated” are both positive and would indicate that the critics enjoyed the movie; clearly that’s not the case here.
Answer: C,E