Which visual distress signal is approved by the Coast Guard?

The choice of red meteor flares as an approved visual distress signal by the Coast Guard is correct because these flares are highly effective in emergency situations. They are specifically designed to be visible over long distances and can be seen from both the air and the sea, making them an essential part of any boat's safety equipment. Red meteor flares produce a bright red light that lasts for a specific duration, signaling distress to other vessels or search and rescue operations.

While other options also serve various signaling purposes, they do not meet the specific criteria established by the Coast Guard for visual distress signals in maritime situations. White smoke signals are not as effective as a distress signal in all conditions, particularly at night. Orange flags can indicate distress but do not provide the same level of visibility as flares. Illuminating devices, while useful for visibility, might not be recognized as an effective distress signal under the Coast Guard guidelines.