The correct answer is A) A yawl will heave to with her jib aback, main sheet eased, and her mizzen sheeted in. Heaving-to is a technique used to slow a sailing vessel's forward progress and maintain position, typically in heavy weather. The configuration described in answer A is the proper way for a yawl (a sailing vessel with a main mast and a smaller mizzenmast) to heave-to. By having the jib aback, the mainsail eased, and the mizzen sheeted in, the vessel will maintain a steady position while minimizing forward motion. The other answer choices are incorrect because they describe the heaving-to techniques for different types of sailing vessels - a sloop (B) and a ketch (C) - which have different sail configurations and require different procedures to effectively heave-to.