The correct answer is A) bow spring line. The bow spring line is a mooring line that runs from the bow of the vessel to a fixed point on the dock or pier. It helps to prevent the vessel from surging forward or backward, and is a critical component of a safe and secure mooring arrangement. The other answer choices are incorrect because: B) bow line connects directly from the bow to the dock, without the angled configuration of a spring line. C) after spring line connects from the stern to the dock, rather than the bow. D) forward breast line runs perpendicular to the vessel, rather than at an angle like a spring line.