Which Analogy Best Describes the Mechanism of ATP Synthase

Which analogy best describes the mechanism of ATP synthase?

A) A ball bouncing down a stairway bumps into a cart and causes it to roll forward.
B) Water flowing across a waterwheel makes the wheel turn, which causes a milling grindstone to turn.
C) A rubber band stores more and more potential energy as it is continually twisted in one direction.
D) A snowball pushed down a hill becomes larger and larger as it picks up snow as it rolls.
E) A bucket of water positioned on top of a half-opened door spills its load as the door is pushed open.