It contributed to the rise of the Ottoman Empire. When the Byzantine Empire ended, the Ottomans received a strong trade port affecting Mediterranean-black sea trade zones.<span />
That is describing what the character does so it is C. It couldn't be A because it isn't a part of the story. It couldn't be B because it isn't a problem. It lastly couldn't be D because it's not a message the author is trying to convey to the reader.
