For what combination is the requirement one handheld orange smoke signal, two floating orange smoke signals, and one electric light?

The requirement for one handheld orange smoke signal, two floating orange smoke signals, and one electric light pertains to day and night visual signals. This combination of signals is designed to provide a method of signaling and indicating distress both during daytime and nighttime conditions.

During the day, the handheld and floating orange smoke signals are quite effective; the bright orange hue and smoke produced can be easily seen against the backdrop of the sky or water. The electric light serves its purpose during the night by providing a visible signal that can be spotted from a distance, enhancing visibility and improving the odds of being noticed by other vessels or rescue teams.

This combination ensures that vessel operators are equipped with appropriate equipment for signaling distress at all times, regardless of lighting conditions, which is crucial for safety and effective communication on the water. Other options are likely focused on either daytime or nighttime alone, or specific types of signals (like pyrotechnic), but they do not encompass the full range of requirements for both day and night visual signaling as this combination does.