C. The repetition highlights the speaker's pleased tone, as he or she is ready for apocalypse
Explanation:
Option C is correct because it actually <em>highlights the speaker's pleased tone, as he or she is ready for apocalypse.</em>
From the poem, we discover that the speaker stated, "Surely some revelation is at hand" - this information actually reveals that the speaker was ready for an apocalypse (an unveiling of a knowledge or revelation). Then he shows/exemplifies that when he exclaimed, "Surely the Second Coming is at hand. The Second Coming!". This statement reveals that the speaker is pleased about was to take place.
