The visual aid that would help a speech about protecting endangered species is a slideshow displaying several images of endangered species, option C.
We call visual aid anything the audience can see during a speech that will help the speaker convey his message or persuade people. Examples of visual aid are:
The visual aid chosen must be relevant and in accordance to what is being said by the speaker. That is why, in a speech about endangered species, the best visual aid would be a slideshow displaying several images of endangered species.
The other options would not be relevant in this context, so we can choose option C as the correct answer.
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