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

A young boy is standing in front of a sink brushing his teeth and dancing. After awhile, he stops to spit in the sink and continues to dance. finally

Options: (I). , the young boy is finished, he spits in the sink again and turns to the camera to smile. (II). , he laughs and tosses the toothbrush into a trashcan. (III). , he spit out the toothpaste and get a face wash. (IV). , he stands up and laughs to look at his foot.
(I).