Http://www.enotes.com/homework-help/dicuss-how-theme-money-cannot-buy-happiness-great-173429
Great notes that elaborate on your prompt with The Great Gatsby.
I think the answer is noun.
The element of Shakespearean tragedy of Romeo and Juliet’s final fate in Act V, scene iii of Romeo and Juliet represents an unhappy ending. This is because when Romeo thought that Juliet is dead, he committed suicide making Juliet to also commit suicide.
It's between A and B but I find that B is the most logical answer