What must be returned if a captain borrows money but does not use the full amount?

When a captain borrows a specific sum of money for a particular purpose, the expectation is that they will use that money responsibly and return any unused portion. Option C is correct because it directly addresses the obligation to return the remaining unused amount before departure. This aligns with the principles of maritime commerce, where financial transactions and responsibilities are closely monitored to ensure accountability and proper management of resources on board.

Returning the unused funds before departure serves to uphold the integrity of the financial agreement between the parties involved, reflecting the trust placed in the captain to manage the vessel’s finances judiciously. This practice supports financial prudence and ensures that the captain is only utilizing what is necessary for the voyage, mitigating risks associated with financial mismanagement.

Returning the full borrowed amount or no repayment being necessary does not acknowledge the specific circumstances of borrowed funds versus actual usage. Similarly, repaying upon arrival may not be practical as it overlooks immediate accountability for the funds used during the voyage. Thus, the requirement to return any unused funds before departure aligns with the fundamental principles guiding fiscal responsibilities in maritime operations.