The correct answer is D. A graph showing the growth of television viewership
Explanation:
Visual aids are graphs, charts, images or any other visual tools that help a speaker to develop presentations by providing the audience with visual elements that summarize, exemplify or show what the speaker is trying to explain and which in most cases are easier to understand that the word of the speaker. Additionally, the speaker should select the most appropriate visual tool according to the subject or the topic, the audience and the purpose of the presentation. If the speech or presentation is about the history of television the purpose is probably to show to the audience how television has change over time, because of this, the most appropriate visual tool in this case is one that allows the speaker to explain how television evolved in some way and thus, "A graph showing the growth of television viewership" should be the most appropriate one as it allows the audience to understand visually how television viewership changes in this case, how it increases during history.
