This is a test of commonsense with single/multi-choices. Complete the next sentence:

The camera pans out to more people and shows them performing an exercise that swings their legs back and fourth. the people

pick from the following. a). now are behind a desk and talking to each other as they relate the exercise.; b). continue to dance and product with one another and end by moving their bodies and touching each other's fingers.; c). continue following the instructor through various movements while he leads them in the exercise.; d). continue to run down the track and riding up and down hills near cameras and audience watching.;
The answer is:
c).