The correct answer is D) jibing. Jibing refers to the maneuver of changing a vessel's direction by bringing the stern of the vessel through the eye of the wind. This causes the boom to swing across the boat, requiring careful control to avoid an uncontrolled jibe which could damage the rigging or even capsize the vessel. The other answer choices are incorrect. Running before the wind (A) refers to sailing with the wind coming from behind the vessel. Reefing (B) is the process of reducing a sail's area, while tacking (C) involves turning the bow of the vessel through the eye of the wind to change direction.