Final answer:
d. 20, For a 20 minute presentation, a good rule of thumb is to use one visual aid per minute, suggesting an approximate total of 20 visual aids. This allows for each point to be properly explained and understood by the audience.
Step-by-step explanation:
The appropriate number of visual aids for a 20 minute presentation can vary based on a number of factors, such as the content complexity, the audience, and the presenter's style. However, as a general guideline for a clear and engaging presentation, it is common to follow a rule of one slide per minute, which in this case would suggest around 20 visual aids.
Therefore, option d. 20 would be a good choice. This allows the audience to fully absorb each slide's information without feeling rushed. Keep in mind that this is a rule of thumb and the exact number may vary. The most important aspect is that the visual aids should enhance the presentation, not overwhelm it.
The number of visual aids needed for a 20-minute presentation depends on various factors, including content complexity, audience engagement, and presentation style. There's no fixed rule, but a common guideline suggests approximately one visual aid per minute of presentation. In this context, a reasonable estimate would be c. 10 visual aids for a 20-minute presentation.