The correct answer is B. A verbal strategy
Step-by-step explanation:
In public speaking, there are multiple strategies used before and during the speech to guarantee the main message is effectively delivered. In the case of pronouncing key words loudly for emphasis, this is a strategy used during the speech to make the audience aware of important terms as these words are necessary to understand all the speech. Additionally, because this strategy involves saying words and including variations in pitch, it is classified as a verbal strategy different from nonverbal strategies such as gestures or prewriting strategies that are used in texts. Therefore the way to complete the sentence is pronouncing key words loudly for emphasis is a verbal strategy used in public speaking.