I believe the answer is C but I havent seen this stuff in a while.
Hyperbole
If don't know what it means its best to start of with what you do know
Process if elimination.
It's not a simile because it has no like or as.
Its not Personification cause its not giving the object human features.
And its not metaphor cause its not literally Applicable. I'm assuming.
So that just leaves you with hyperbole.
Answer:
something hidden but important, something that shapes the meaning or effect of something else, without being explicit itself.
Explanation:
It is The Romans called the island Albion Albion became known as Angle-land and later, England. The people were called the Angli and later. English.