Which type of vessel is NOT considered "restricted in her ability to maneuver"?

Answer: C — pushing vessel connected to a vessel being pushed

A vessel that is classified as "restricted in her ability to maneuver" is typically engaged in operations that limit its capacity to change course or speed. This designation includes vessels involved in activities such as dredging, towing, or those like a pushing vessel which is physically connected to another vessel, thus affecting its maneuverability. In the case of a pushing vessel connected to a vessel being pushed, it is indeed restricted in its ability to maneuver because its movements are dependent on the vessel it is pushing. This connection creates a situation where the pushing vessel cannot navigate as freely as it would if it were operating independently. On the other hand, a vessel laying anchor is not considered restricted in its ability to maneuver since, while it is fixed in one position, it can generally shift its anchor or change its orientation as required. This difference in operational flexibility is why a vessel laying anchor is not categorized as restricted, making it the correct answer to the question.