A is correct...
hope helps
<span>The oil demand that is represented by large oil tankers is 2 million. The booming of business or oil tankers paved way to this happening. Many oil companies went down and maritime tankers closed during that period. A 2 million worth of oil is demanded to be represented by oil tankers that made the situation worst.</span>
In history such as World History? You should be able to distinguish the trends and differences in different periods say "Period 1 vs. Period 2" where each period represents a different range of years (in AP World History I learned it with 6 periods but it varies from year to year of when it is taught)
The answer here <em>could </em>be either B. or D. But B. is the most correct, given that the question is so general.
Do you have to write a paragraph for each one