Answer:
The pardoner actually presents his theme in his tale, thereby giving the moral that greed is the root of all evil.
Explanation:
Well D and A couldn't be it so I think it'd either be C or B. Honestly I think it is most likely to be C.
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This sentence has unequal ideas joined by a subordination conjunction.
Since the ideas in the sentence imply causation (the broken pulleys caused the inability to raise the flag) it means that the ideas are unequal. It is also necessary to join them with a subordinating conjunction, which show the causality within the sentence. In this case that subordination conjunction is "because".