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

A group of cheerleaders perform doing a tower, then the cheerleaders jump down. after

[a]. , the cheerleaders jump, flip and does cartwheels.;
[b]. , the cheerleaders climb the stairs and check each place.;
[c]. , the girls jump on the shoulders of other cheerleaders, and then they run.;
[d]. , the girls wearing ruffled polka dots perform and cheer for gray team.;
[a].