An introduction comes onto the screen for a video about playing tennis. And man comes on to talk about the lessons that he will be teaching in the video. he <sep> (A) shows various examples of the court tennis game that he is participating in. (B) swings the racket several times to demonstrate a good form for swinging the tennis racket. (C) begins by introducing several tennis sanding techniques and how to handle them as a practice tennis player. (D) starts by letting you know when he has finished his tutorial and who and what he teaches.
B