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

A crowd watches a gymnastics show. a gymnast

Available options:
 (a). runs up to a high bar and alternates between the high and low bar, performing various gymnastics moves and flips.;
 (b). makes a jump and land on front others.;
 (c). walks to the center of the gym.;
 (d). easily flips backwards over a bar.;
(a).