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

Available options: (a). , the young boy is finished, he spits in the sink again and turns to the camera to smile.; (b). , he laughs and tosses the toothbrush into a trashcan.; (c). , he spit out the toothpaste and get a face wash.; (d). , he stands up and laughs to look at his foot.;
(a).