In the video, the fading out of the actors’ voices adds to the development of the author’s point mainly by .
Answer choices for the above question
A. conveying to the audience that lipreading is difficult
B. conveying to the audience that people need to speak more clearly when someone they are speaking to is lipreading
C. conveying to the audience the physical experience of being deaf and trying to read lips
D. conveying to the audience that lipreading is easier with some people