Final answer:
The correct answer is Seven or fewer audio participants.
Step-by-step explanation:
The question asks how many participants can be added as audio participants using their phones in a video visit where the number of video visit participants is 7 or fewer. Since the number of audio participants is not specified, we can assume that it can be any number. Therefore, the correct answer is Seven or fewer audio participants. This means that the number of audio participants can be any number equal to or less than seven.