For the last question, over the course of the last couple days, I have answered the final question with each of the 4 answers and have gotten it wrong every single time. How can none of the answers be correct? I've kept the order I answered them written down so I know I didn't miss any of them. Is this a bug? I know I used all 4 answers on all 4 attempts.

It happened to me as well, it was reported and fixed. I was able to answer yesterday and got it correct, and won. Try your answers over again and one of them should come up as correct.

Of course, it was my first answer. Thanks for the help Chedori.