I think the sentence that uses correct capitalization is the first one.
What poem is this? I can help you if I can read the poem.
I am pretty sure that in brooks' novel, the rector presents the plague as <span>a chance to save the souls of nonbelievers. I consider the third option as the correct one as author represented as if it will refine the villape people's souls.
Hope you will find it helpful!
Regards.</span>
