What happens next in this paragraph?

A woman demonstrates how to do sit ups, in a gym room, using a woman who is simulating the exercise as an example. a woman
Possible answers:
i. kneels on the hardwood floors of a gym room and talks to the camera.;
ii. stands with legs slightly parted and demonstrates more self-pressing techniques scrolling down.;
iii. at a table talks into the camera while the woman sets a cowboy hat down.;
iv. uses a half-block exercise machine, by herself, to exercise.;
i.