The answer might be "us" because there might be an emphasis on the word.
Answer:
Pretty Sure it is A
Explanation:
Implicit statements imply something, such as in this case, that Erika is nervous and something is about to happen. In explicit statements, something actually happens. Erika is acting out, so there is no suggesting it, she is simply doing so. Therefore, it is most likely A.
So the presentation can focus on only the important details and so people don't get bored because it is to long