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

A bicycle riding course with bumps is shown. A number of bicycle riders are shown going through the course. a finger

Choose from:
(a). pushes a button on the device and the screen turns pink and a pattern appears with words on it.;
(b). covers part of the camera.;
(c). pointing holes in the machine then changes to the camera view.;
(d). extends into the distance followed by more riders.;
(b).