Задание 11 (Чтение) на ЕГЭ по английскому

I don’t know

buried under water / remain underwater for some time to do real work / branch of underwater archaeology / interchangeable terms / it is safe to say that / submerged objects / transported over water / written records they left behind / pay close attention / what people were really like / discovered underwater / object made by humans / sunken ships or old cities / before invention of writing / study of archaeology done underwater / is concerned only with

tenses?

Archaeology done underwater
Nautical archaeology is the science of finding, collecting, preserving, and studying human objects that have become lost or buried under water. It is a fairly modern field of study since it depends on having the technology to be able to remain underwater for some time to do real work. Whether it is conducted in freshwater or in the sea, A __________, nautical archaeology is another way of learning more about the human past.
Although some use the words nautical archaeology to mean a specialized branch of underwater archaeology, B__________, most consider the term to mean the same as the words underwater archaeology or marine archaeology. All of these interchangeable terms mean simply C__________.
Once real trade began, it is safe to say D__________ was probably transported over water at some point in time. By studying submerged objects, we can learn more about past human cultures. In fact, studying ancient artifacts is the only way to learn anything about human societies E__________. Being able to examine the actual objects made and used by ancient people not only adds to the written records they left behind, but allows us to get much closer to the reality of what life was like when they lived. Also, if we pay close attention to how the objects were made and used, we begin to get a more realistic picture of F__________.

the text and explain your choice