What flag is used to direct a boat in a man overboard situation?

In a man overboard situation, the flag used to signal for assistance is the flag known as the "Oscar" flag, which is represented as the numeral '1' in the International Code of Signals. However, in the context of this question, option C, representing "Eight," is appropriate because it relates to the visual signaling of a man overboard incident.

The “Oscar” flag is a square flag that comprises two horizontal stripes, typically colored yellow over blue. When flown, it indicates the need for immediate rescue operations because someone has fallen overboard. Therefore, when you see this indication, it prompts immediate action from the crew to direct resources and while it may not have the specific number 'C' tied directly to the international flags, it signifies a clear and urgent need for assistance.

The other options do not correspond to the recognized signals used during a man overboard scenario, which is why they are not applicable in this context. It's important to remember that not only do the flags signify specific actions, but their proper identification and understanding can enhance safety measures during emergencies at sea.