Final answer:
The key advantage of speaking is that you get instant feedback from your audience, enabling immediate interaction and adjustments during communication.
Step-by-step explanation:
An advantage of speaking is A. You can receive instant feedback from your audience. This is important because it allows for immediate engagement and the ability to adjust your message based on the audience's reactions. Speaking enables you to participate actively in discussions, show emotion through gestures and expressions, and contribute to the flow of communication with fluency. However, unlike written communication, speaking does not often leave a permanent record unless it is recorded, and emotions may be harder to conceal when speaking in comparison to writing.