The correct answer is A) after spring line. The after spring line is a mooring line that runs from the stern of the vessel to a fixed point on the dock or pier. This line helps to keep the stern of the vessel secure and prevents it from swinging out. The illustration D044DG clearly shows the line labeled "D" running from the stern of the vessel to the dock, which matches the definition of an after spring line. The other answer choices are incorrect because they refer to different types of mooring lines. A waist breast line runs from the midship area of the vessel to the dock, a stern line runs directly from the stern to the dock, and a forward spring line runs from the bow of the vessel to the dock.