Silence is a blank space that begs to be filled is and example of a metaphor.
A metaphor is a literary technique where one thing is compared to or called another thing that it is not literally. In this example silence is being called something that it isn't actually...a blank space that begs to be filled.
Irony is when the audience or reader knows something that the characters do not, and shows a difference between reality and appearance, simile is a comparison of two things that uses like or as, and hyperbole is an exaggeration made for effect.
In my opinion, the correct answer is B. <span>one adjective clause. This clause is "</span><span>which is perhaps the most famous border ever established by surveying methods". It modifies the subject ("The Mason-Dixon line"), providing an additional description for it.</span>
I'd say it was D or the last choice. It makes most sense to me.
C. Caesar is in danger on the Ides of March, especially in light of Cassius' plot against him. It means Caesar's life is in danger on that day.