Which audio element of the national geographic video most clearly sends a message that the people should be scared of the flu

unpleasant coughing sounds - apex

The correct answer is the coughing sounds from the little girl, coupled with the image of the dropplets of water, considered to be filled with new viruses, that are ready to contaminate other people.

Explanation:

The video "How Flu Viruses Attack" was produced by National Geographic with the intention of explaining to people the reason why it is so easy for people to get infected by Flu viruses, when the proper measures are not taken to prevent expansion, especially in flights. But aside from the information delivered about what the Flu viruses are, how they spread, and what they can cause, the video focuses on a series of sensorial images and auditory impressions that seek to reinforce the seriousness of the situation, so that people no longer take the Flue lightly. One such impressions is seeing the little girl, the originator of the contamination in the fight, coughing constantly, as well as her profile, which indicates how sickly she really is. This causes a lot of shock on the viewer and reinforces the message sent by the video.