When hip towing, a line led from the stern of the towboat forward to the barge provides the towing pull when __________.

Correct Answer: Option D — backing

When hip towing, the forward-leading stern line is critical during backing maneuvers. Because the towboat's primary propulsion is at the stern, this line prevents the tow from pivoting away from the tug, ensuring the tug maintains positive control over the barge's heading while moving in reverse.