Write the next sentence in the following story.

A man serves a tennis ball when playing tennis with a person in a tennis court. then

Select from the following. 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.. The answer should be
a.