What happens next in this paragraph?

There are several men dressed in biking gear and helmets participating in a dirt bike competition. there
Choose from:
I. are several spectators watching the event.
II. is a young man in orange training equipment with another young man in khaki to " flip " his boot.
III. are many side streets and cars in the background as they are competing.
IV. are hundreds of people waiting to start the event.
I.