Question 766 Rules of the Road

The correct answer is A) A diamond. According to the International and Inland Navigation Rules, a partly submerged vessel that is being towed must display a diamond shape. This is specified in Rule 24 of the Navigation Rules, which states that a "partly submerged vessel being towed" must exhibit the same lights and shapes as a vessel being towed, which includes displaying a diamond shape. The other answer choices are incorrect because they do not match the specific requirement for a diamond shape on a partly submerged vessel being towed. Black balls or cones are used for different purposes, such as indicating the type of vessel or its activities, but do not apply to the situation described in the question.