What characterizes a sailing vessel?

Answer: B — sailboat under sail without engine propulsion

A sailing vessel is characterized by its primary means of propulsion, which is the use of sails. When a sailboat is under sail without using engine power, it is relying entirely on the wind to move. This definition aligns with maritime regulations, particularly the COLREGs, which specify that sailing vessels are those that are primarily propelled by sails and not engines. The other options describe characteristics that do not align with the definition of a sailing vessel. For instance, a vessel using engine power does not qualify as a sailing vessel when it is operating under engine propulsion. A vessel limited to recreational use would not encompass the various commercial applications of sailing vessels, such as those used in fishing or transportation. Lastly, any vessel that is under construction has no relation to its operational characteristics or classification as a sailing vessel. Therefore, the correct identification focuses on the vessel's use of sails as its primary means of movement.