[markc]

>A rolls one trip around circle B

Without the diagram (which I didn't see until watching the video) this is ambiguous. In my visualization, the plane of the small circle (A) was perpendicular to the plane of the larger circle (B). (Think of circle B drawn on paper, while circle A is a coin on its edge)

With that interpretation of "rolls one trip around", 3 is indeed is the correct answer.