A - Timeline
A timeline would allow for historical events to be noted and compared to the events happening in the story (dueing that particular period in time).
A Venn Diagram would be most useful to compare (and contrast) one particular incident.
A chart is a little vague as to how it would be beneficial.
Answer:
The irony is what you expect is going to happen but something else happens.
Answer:
A) Gatsby rejects what Nick says, insisting that one can repeat the past. "Can't repeat the past?' He cried incredulously. 'Why of course you can!"
Explanation:
When Nick Carraway tells Gatsby in The Great Gatsby that he cannot repeat the past, Gatsby responds, "Can't go back in time?" Why, of course you can! "