Write the next sentence in this paragraph:

An introduction comes onto the screen for a video about bmx riding. several bmx riders

Choose your answer from:
a). show off their skills and impressive skills in the beginning of their competition..
b). are shown on multiple adult bikes on a track..
c). are shown doing tricks and riding on the track..
d). are shown, kickboarding as well as lift each others legs and continue to ride around..
c).