The correct answer is B) Both the towed and towing vessels reach a wave crest or trough at the same time. When towing, it is important for the towed and towing vessels to be "in step" with each other as they encounter waves. This means that the towed vessel should reach the crest or trough of a wave at the same time as the towing vessel. This helps to minimize stress on the towing hawser and prevents potential damage to the vessels. Being "in step" ensures the towed and towing vessels are moving in sync with the wave patterns. The other options are incorrect because they do not accurately describe the concept of being "in step" in towing operations. Option A refers to turning, option C describes the towed vessel following the wake, and option D is about the towing hawser, none of which directly address the timing of the vessels relative to the waves.