I think they add mood and other text features.
I think this might mean that you or on the wrong side of an idea or topic . If you are on the other side you would be on the good/ right side of the fence
I think C is the best option
What you do is 30 pictures Divided by 6,which equals 5.
Or another way is multiply upwards
ex.6x3=18 (keep going)6x4=24(keep going)untill you get 30,6x5=30
