A towing vessel should be on the crest of a wave at the same time as its tow and in the trough at the same time. The term used to describe this is __________.

Correct Answer: Option D — being in step

Being in step describes the synchronization of the towing vessel and the tow with the sea state. When both are on the crest or in the trough simultaneously, the hawser tension remains relatively constant, reducing the risk of parting the line or causing structural damage to the vessels.