According to the narrator, of the following activities the monk preferred studying texts of his order dressing and eating well manual labor praying the hours

I believe the answer is actually B, dressing and eating well because hes not like the other monks of his time. Most monks of the Middle Ages lived in monasteries, which demanded that they devote their lives to “work and prayer.” This Monk cares little for the Rule; his devotion is to hunting and eating. He is large, loud, and well clad in hunting boots and furs.

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and also the mystery girl it might be someone that she might know in her school