"mankind was my business"
Answer:
<em>C. the nation, and since then,</em>
Exclamation: If you're joining two sentences together you need a comma to do so. By placing a comma after "nation" and "then" you are making a run-on sentence.
Explanation: the correct answer should be at it is not always stated overtly and is understood only by reading the whole poem..
this is correct because the theme usually does not change itself, but there can be multiple things analyzed. It is rarely stated overtly the and requires some analysis and understanding so as to find it.
I'm going to guess alliteration, sorry if i'm wrong