Question 266 Deck General

The correct answer is D) Two containers. The reason for this is that under normal weather and sea conditions, lashings are required when the tier of containers secured with twist locks exceeds two containers in height. This is a standard industry practice and regulation to ensure the stability and safety of the stacked containers during transport. The other answer choices are incorrect because: A) Lashings are not required for a single container, B) Lashings are not required until the tier exceeds two containers, and C) Lashings are not always required, only when the tier height exceeds two containers.