I just took the test and C is not the correct answer. I do not know what the correct one is, but here is feedback I got from the test, "The way characters behave and the choices they make help develop a story's theme."
Using this feedback, I think the answer would more likely be A) Pitys dies due to her involvement with pan; this shows that nature can quickly turn from delightful and pleasurable to dangerous and violent, BUT I AM NOT 100% SURE.