Final answer:
One way to determine if your presentation is clear and concise is if your listeners can summarize the ideas you present.
Step-by-step explanation:
To determine if your presentation is clear and concise, there are several indicators you can consider. B is the correct option. One way to gauge the clarity and conciseness of your presentation is by assessing if your listeners can summarize the ideas you presented. If they can accurately summarize the main points of your speech, it indicates that your presentation was clear and concise.
Additionally, other factors such as being prepared in advance, using a reasonable number of speaking notes, and using simple language can contribute to the clarity and conciseness of a presentation, but they are not definitive indicators.