What happens next in this paragraph?

A man in a classroom sitting down on a stool playing a guitar in from of adult students. the man
OPT:
(a). demonstrates a guitar on his lap and then begins to play.
(b). are playing the guitar while microphones are on as he spins and stands up.
(c). stands up from the stool and the people clapping can be heard.
(d). picks up the guitar with the hand signs.
(c).