[![enter image description here](https://i.stack.imgur.com/xmAHO.png)](https://i.stack.imgur.com/xmAHO.png)

Can someone explain to me why it is B?

Is it because eddy currents are induced on the side of the disk, and since it is connected to Y it basically goes through Y to X etc? But it is also connected to X?

Exam tomorrow thanks !!