I would say the last one doesn't make any sense, because it attempts to blur the lines between what makes something art, versus it being literature. Instead of connecting the two through theme or emotion, it attempts to make the generalization that they are exactly the same. Also, this option is kind of like the black sheep in comparison to the other answers, as the others all delve into the subject matter, and this one gives no reasoning. If one of the other's are wrong, then that would pretty much mean that they are all wrong, which wouldn't make much sense.
