Answer: B. Pausing before speaking to make the point stronger.
Step-by-step explanation: A rhetorical device is a tool or a group of tools with the main function of having an effect on an audience (it can be readers or listeners). In the given examples of rhetorical devices the one that is unique to speaking is pausing before speaking to make the point stronger, because when we read something, not necessarily we will make the pauses the author intended to write, but when speaking, pausing is a tool often used to emphasize a point or an emotion.