Scenes B.1, B.2, and B.3 each return to scene B. This is a common structure for menu scenes that point to other single scenes.
Lingo scripts attached to the three buttons at the top left of the Stage, use markers to specify a sub-scene. Use the go marker(n) command to jump to the nth marker in the Score.
The two buttons below the go marker buttons, jump to Scene A and Scene C. Because Scene A is before Scene B, go previous works. However, because three scenes are between Scene B and Scene C, Scene B uses the statement go to frame "C" to jump to Scene C.