Question 5075 Deck General

The correct answer is D) step. The condition where a MODU (Mobile Offshore Drilling Unit) on the end of a tow line is riding a wave crest at the same time as its tug rides a wave crest is known as "riding in step." This term refers to the synchronization of the wave motion between the towed vessel and the towing vessel, which can lead to increased stresses on the tow line and potential stability issues. The other answer choices are incorrect because "harmony" and "synchronism" do not accurately describe this specific condition, while "check" does not have a clear meaning in this context.