Question 372 Deck Safety

The correct answer is C) yellow. According to the United States Coast Guard regulations, the color of the signal flare sent up by a submarine coming to periscope depth is yellow. This is done to alert other vessels in the area of the submarine's presence and its intention to surface. The yellow color is specifically chosen as it is a highly visible signal that can be easily distinguished from other maritime flares or distress signals. The other answer choices, such as red, white, and green, are not the correct colors for a submarine's signal flare. These colors are typically used for different purposes, such as emergency signaling or navigation lights, and would not be the appropriate choice for a submarine surfacing notification.