What happens next in this paragraph?

A man stands next a young man sitting on a rowing machine while talking. The man instructs the young man to put the feet on the machine. then
Available choices:
(a). , the young man takes the foot to adjust the handles on the machine..
(b). , the young man couches on the machine while the man sits like a thoist, then he put the feet and close chest..
(c). , the man shows how the young man pulls the handle until the chest while he continues talking..
(d). , a man lifts the boy and sits him on the shoulder, then puts the feet on the machine and continues talking..
(c).