What is the term for a vessel restricted in its ability to maneuver?

Answer: B — vessel constrained by her draft

The term for a vessel restricted in its ability to maneuver is defined primarily by its operational limitations, which include aspects such as its draft, which indicates how deep the vessel sits in the water. A vessel constrained by her draft refers to a situation where the vessel cannot safely navigate through shallow waters due to its depth below the waterline. This specific restriction affects its ability to change course or speed, and it is crucial to recognize this status under navigation rules to ensure safe passage, especially in confined or shallow areas. In contrast, a vessel on a floating dock, one undergoing maintenance, or a vessel at anchor do not adequately describe the navigational limitations imposed by draft. While these scenarios may involve operational constraints, they do not inherently indicate that the vessel is restricted in its ability to maneuver due to being unable to operate effectively in certain conditions. Hence, the most appropriate choice is the vessel constrained by her draft because it explicitly highlights a cause of maneuverability restrictions in navigation.