Task: Text Completion
Input (English): A man serves a tennis ball when playing tennis with a person in a tennis court. then <sep> (A) , the man serves again to a person behind the net, while a player stands next to him. (B) , the man serves the ball continuing the volley. (C) , the man serves the ball with a racquet leg. (D) , the man serves the ball alone and then hits it against the wall.
Output (English): A