What happens next in this paragraph?

A man is showing a boy trying to solve a rubix cube. A timer is going to time the boy and other people around him are trying as well. on lookers
OPTIONS:
[a]. are scrolling through the detail of the puzzle, the boy turning the dial.
[b]. are going from table to table to watch.
[c]. he is able to solve the cube.
[d]. , the young boy has been trying to solve the triple cube 3 times.
[b].