Probably D. It is a pretty vague fact that you can give lots of information on, you dont wont to give all your information in the thesis, but you want it to catch your readers attention.
Going out with my friends and cutting stuff
"Wider still, and wider, shall thy bounds be set;" if this refers to the British Empire I believe it means that it is commenting on the expanding boundaries of this Empire as new lands are conquered and turned into colonies. At one time, Britain had far flung colonies in Africa, Asia and also the 13 colonies and Canada before the independence movements of the late 18th century in America and also 20th century in Africa. In other words, at one time the world was colonized by primarily the Spanish, the Portuguese and the British and the colonies had to supply the raw materials to the colonizers and were an appendage of the big powers.
part B and part a
I think because he also saw that back people give it a big čule or hint it's part a or part b
B. Metaphor
It is describing the world as something it isn't really.