If you are preparing a short story for publication, it naturally implies that your intended audience is the general public. The purpose of any form of fiction writing depends heavily on the author´s intentions, which can´t be generalized; however, one aesthetic characteristic that all fiction shares is that it is a creative product that aims at entertaining the reader for if the piece of writing lacked this characteristic it would most likely not be considered for publication.
I would say that the answer is to entertain because it doesn't give a topic for the short story, but it's just fiction and most fiction stories are to entertain.
The leadership on the farm is a dictatorship. The pigs have all the power and choose who lives and dies. They also much like the Russian government take everything for themselves and make the people of lesser status do all of the work.
The rhetorical device that is used in this excerpt from Mark Twain's "The Danger of Lying in Bed" is anecdote (assuming that your options are allusion, rhetorical question, anecdote, and logic).