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

Two little kids are sitting indian style on the carpet inside the house, they have a hookah and are smoking it. They take turns inhaling and exhaling the smoke. they

OPT:
(i). exhale from their nose like they do it often and have been trained like little pros.
(ii). take turns moving back and fourth holding the hookah from their mouths walking around the room.
(iii). get up, that is how it is done.
(iv). crunch their teeth together as they do this ,.
(i).