Question 390 Rules of the Road

The correct answer is B) firefighting. According to the U.S. Coast Guard regulations, a vessel engaged in public safety activities, such as firefighting, may display an alternately flashing red and yellow light. This special light is used to indicate the vessel's special status and purpose, allowing other vessels to recognize and avoid interfering with its operations. The other answer choices, such as submarine operations, river bank protection, and law enforcement, do not typically utilize this specific light configuration.