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

A countdown from ten to zero is shown. We then see a group gathered in a gymnasium. the instructor

Available choices:
[1]. is taking a break from his tutorial..
[2]. walks up, and everyone starts a zumba exercise..
[3]. begins by showing how to properly hold a torch..
[4]. then begins: three people climbs the bars on the fourth floor..
[2].