While underway and towing an unmanned tank barge you are required to __________.

Correct Answer: Option D — maintain a strict watch on the barge from the towing vessel

When towing an unmanned tank barge, the towing vessel is responsible for the safety of the tow. Maintaining a strict watch ensures that any potential hazards, such as leaks, structural failures, or security breaches, are identified immediately, fulfilling the Master's duty of care under general maritime safety regulations.