Question 456 Rules of the Road

The correct answer is D) None of the above. The reason is that the given situation describes a crossing situation under the International Regulations for Preventing Collisions at Sea (COLREGS), where vessel "A" is the stand-on vessel and vessel "B" is the give-way vessel. In this case, vessel "B" is not required to sound any whistle signal. The proper action for vessel "B" is to take early and substantial action to keep well clear of vessel "A", as per Rule 16 of the COLREGS, and not to sound any whistle signals. The other answer choices are incorrect because they do not match the proper response for the given crossing situation under the COLREGS.