I know an answer is A for sure but i forget the others. A is an answer though.
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I think this is the answer not sure.
He was exiled from Florence for political reasons. Very roughly speaking, Dante was an advocate of a strong Holy Roman Emperor, and thought Florence should subject itself to the HRE. This made him two sets of enemies: those who thought Florence should rule itself, and those who wanted to ally it with the secular claims of the Papacy.
You didn't include any of answer choices but i can guarantee you its whichever one that has to do with Christopher getting distracted and not concentrating on his studying. Not taking proper notes, or just general bad studying habits.