Here is my answer. Hope this could help!
The American Crisis<span> is a pamphlet series by eighteenth century Enlightenment philosopher and author, </span>Thomas Paine<span>, originally published from 1776 to 1783 during the American Revolution. ... The pamphlets were contemporaneous with early parts of the American Revolution, during a time when colonists needed inspiring works.</span>
So I normally use the word Climax but I'm assuming that climax and main action are the same thing. The main action is definitely (B) - Mary's husband tells her that he is leaving her, because that is what starts the suspense.
Please tell me if that isn't right, I think it is.
I'd say it was D or the last choice. It makes most sense to me.
