Write the next sentence in this paragraph:

A woman dressed in gym clothes is doing a tutorial on spinning in a gym. She is demonstrating the dumbbells that she will be using. she

Select from: (I) goes back and forth over the dumbbells while talking about each one.. (II) shows how to dismount the dumbbells to jump them onto a mat.. (III) steps up and down on the dumbbells.. (IV) then demonstrates the exercise bike and continues to bike along with some other women at the gym..
(IV)