What happens next in this paragraph?

Two men are posing in a photo for martial arts. a group
OPTIONS:
[a]. of athletes watch on the sidelines as a man takes a stance at the front of the arena's court..
[b]. of young men are standing around small tape measure, measuring..
[c]. of people walk past a stadium..
[d]. is gathered inside a room, shown in various martial arts poses..
[d].