I have never read "The Nun's Priest's Tale," but based on the excerpt, I would say the answer is C.
Answer: Struggle means sacrifice. It means you do everything you can to succeed towards your goal. It means you risk stability, relationships, and finances for your vision. Making this level of commitment is where struggle actually shows up, because it's not easy.
Explanation:
You can only take:
<span>Planetary cycles </span>
<span>Astronomical cycles </span>
<span>Climate and weather cycles </span>
<span>Geological cycles </span>
<span>:) hope I helped you out.</span>
Most likely it will be found under textbook :)