Multi-select problem: How does the next paragraph end?

A group of dirt bikers are at the top of a hill. The gate opens, and they begin to race. they

Choose from:
1). ride around the track, jumping bumps against each other.
2). go over hills and jumps and to large boulders.
3). do smooth jumps down the slopes.
4). race around the track and over numerous hills.
4).