Write the next sentence in this paragraph:

Six people in helmets race on dirt bikes around a circular, paved track surrounded by grass, game tents and onlookers. the people

Pick from: i. jump over a 50 foot high wall then join a line squatting with their bikes on the sandy field of grass as they ride their bikes around.; ii. sail through the course with big shuttlecock steppers.; iii. are then seen riding, kicking, and jumping on inflatable tubes until socks get muddy.; iv. start the race behind a closed and grated fence, which then opens and allows them to start racing from an elevated platform down onto the paved raceway.;
iv.