Which code is used to signal a small boat recall?

The code used to signal a small boat recall is indicated by the flag for "QUEBEC." This flag is part of the International Code of Signals, which utilizes various flags to convey specific messages in maritime communication. The "QUEBEC" flag specifically serves to alert small boats that they should return to their point of departure.

In this context, understanding the use of these flags is important for safe navigation and communication in marine environments. Each flag represents a different message, and "QUEBEC" effectively communicates the necessity for small boats to return, which is crucial for coordinating activities in busy or compromised areas.

The other flags mentioned in the choices represent different messages under the same international signaling system, thus signifying other meanings unrelated to the recall of small boats. Knowing the specific purpose of each flag helps ensure clarity in maritime operations.