It might be C, since D isnt related to the topic, B is just one line from it, A is also not really related to the short story.
Im so so sorry if its wrong!
I believe it's B, parentheses.
Comment the correct answer.
With the invocation,in which the poet asked the muse for help in telling the story
The main idea doesn't explain in detail why it is the main idea. It doesn't prove that it is the main idea, it only states so.
