The correct answer is C) Electrical loading. Dynamic braking on an anchor windlass relies on electrical loading to slow down the rotation of the windlass motor. When the windlass is lifting the anchor, the motor is being driven. To stop the windlass, the motor is switched to act as a generator, creating an electrical load that opposes the rotation and slows the windlass down in a controlled manner. This dynamic braking system is more effective and reliable than relying solely on mechanical friction brakes. The other options are incorrect because they do not accurately describe the principle behind dynamic braking on an anchor windlass. Option A, compressibility of air, is not relevant. Option B, mechanical friction, is not the primary mechanism of dynamic braking. Option D, mechanical distribution, does not explain the electrical principles involved.