A ring A, a perforated sphere B (3 small-radius holes are drilled symmetrically through a solid sphere), and a perforated cylinder C (3 small holes drilled through the axis of a solid cylinder, halfway from the ends at 0°, 60°, and 120°.) all have the same mass and the same radius. They are placed at the top of a ramp and each can roll down it without sliding. They are placed at the same distance up the ramp and are released at the same time. What is the order of their finish at the bottom?