Write the next sentence in this paragraph:

There are balls left all over the court. The woman is hitting balls again while the trainer watches. a couple

OPTIONS:
(a). of different balls are in the locker rooms to protect each other.
(b). are walking by behind the fence.
(c). of teams are when a woman on the same team hits the balls back to her.
(d). stands up and they start hitting balls again.
(b).