1. I haven't read the story, can you post a link with it so I can help?
2. Well, first off theme is shaped by the character, setting, and even the plot of the story. Setting affects the theme in major ways! It contributes to plot and the characters. Without setting...there will be no plot for the story.
I think it's A. Allusion. By using allusion, you refer to other people, places, or things. Terza Rima is a rhyming scheme, I believe. contrapasso is a belief that the punishment should fit the sin. Anaphora is the act of replacing a word in a sentence to avoid repetition. So I believe that A. Allusion would be the right choice :)
B. He's going to try to move move west w/Myrtle
A. Weddings can be very expensive if you don't keep a strict budget.