What happens next in this paragraph?

The latch is let down and they all take off into the dirt and start to race in the dirt. many of the boys
Options:
(I) are followed by the horses as the same race continues and they push the horses hard..
(II) are gathered in a circle a watching one after the other..
(III) keep going around the track and people are spread throughout the course holding up sticks..
(IV) stop and wave and talk to one another..
(III)