The correct answer is C) ominous music.
The audio element of the National Geographic video that most clearly sends a message that people should be scared of the flu is ominous music.
We are referring to the video "How Flue Viruses Atack," produced by National Geographic. In this short and descriptive vide, it is shown the way flu viruses easily spread and can be contagious, affecting a big portion of the population. It uses examples of cases of other countries and also shows statistics. Another important aspect in the production of the video is the narrator's vice that gives it seriousness.
