I can't think of four things but I was always taught to always cite everything. Even if you think something is an original idea or phrase, look it up and make sure and if someone else has said that just put it in your work cited because that could be considered plagiarism. Also always cite direct quotes
Where the choices?........
ADVISE : First off, never start your thesis statement off like " i'm going to tell you" or " In this." you want to grab the reader, and make the reader want to read more. You could start your thesis with a quote from O'Conner or a random quote about your subject. This tends to grab the reader, if they like the quote. You may also start your your thesis with a question that you may think people will have about the short story, or you had while reading the short story, you MUST answer this question in your writing though. Secondly, try not to make your thesis so long, this may lead the reader to bordome, but also dot make your thesis to short