The figure shows two metal disks of the same size and material oscillating in and out of a region with a magnetic field. One disk is solid; the other has a series of slots.

Part A:Is the retarding effect of eddy currents on the solid disk greater than, less than, or equal to the retarding effect on the slotted disk?

Part B:Choose the best explanation from among the following:

A:The disks are the same size and made of the same material; therefore, they experience the same retarding force.

B:The slotted disk experiences the greater retarding force because the slots allow more magnetic field to penetrate the disk.

C:The solid disk experiences a greater retarding force because eddy currents in it flow freely and are not interrupted by the slots