Multi-choice problem: Continue writing the next sentence in this paragraph:

A camera pans around large city buildings and leads into people riding motocross bikes. more clips

Available choices:
--are shown of people biking as well as running numerous kilometers.;
--are shown of people riding motocross bikes while clips are shown of people shuffling on a cross.;
--follow as the camera interviews other riders riding the motocross bikes.;
--are seen of people performing tricks on the bike while hundreds watch on the sidelines.;
are seen of people performing tricks on the bike while hundreds watch on the sidelines.