Multi-choice problem: Continue writing the next sentence in this paragraph:

Another man appears swinging around a tennis racket. He bounces a tennis ball on the floor while the other man walks into frame. they

(I) engage in a game of tennis.. (II) continue to swing at each other.. (III) are then shown hitting the ball back and fourth against the wall.. (IV) talk for a bit while walking around and preparing to play..
(IV)