B because you could have ended the sentence there but you didn't. also if you use semicolons you don't need because. you would also not put i has before.
<span>the sound device which is best expressed by the bolded words is repetition</span><span />
To understand this phrase you have to analyze it in pieces.
Courtier is a word to describe a person that goes to the court to present, in this case, poetry. The court was the place where the powerful people (kings, princes, queens, royal governors...) of society would go to have a different kind of reunions and presentations.
Middling is a word that was used as a synonym for standard, regular. Here it means that the poet is not particularly bright, not all that talented.
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