The correct answer should be the third one you listed. The "current drag" then is a device that is used in order to measure the sub-surface currents. This device and the measurements it provides are extremely important for the field of oceanography which studies the aspects of the oceans both the physical and the biological ones.
I think the answer is C). Floor Consideration because the passage something about the floor being open. That's my reasoning. I f it is not the correct answer and you get the correct answer please let me know because i am taking a test with this question it and i don't know the answer. So, thank you and I hope I helped.
Answer:
the availability of iron and coal, discovery of the New World, and an energetic scientific community.
Explanation:
Germanic tribes -- especially the Visigoths -- attacked the Roman empire and caused it to weaken.
There had been ongoing migration of Germanic tribes into Roman empire territory, that had a gradual weakening effect on the empire. The western tribes consisted of groups such as the Alamanni, Franks, Angles, and Saxons. There was also a large group of Germanic tribes known as the Goths. We speak of the Visigoths and Ostrogoths do distinguish between the western and eastern Goths. The Visigoths (western Goths) invaded the Roman Empire, and defeated Roman armies at the Battle of Adrianople in 378. Later, the Visigoths even invaded Italy and sacked the city of Rome in 410. So I suspect the answer your question is primarily looking for is the Visigoths.
