Write the next sentence in the following story.

A group of dirt bikers are prepared at the gate. The gate opens, and they take off. they

Choices: (i) go down a hill in a race car over rocks and trees in the race track. (ii) go roaring over turbulent water, flipping over large rocks. (iii) go down a hill and across a course of dirt. (iv) go over hills and around curves trying to win the race.. The answer should be
(iv)