Which purpose of mythology is not illustrated by the story of arachne?

literature
religion
explanation of natural phenonmena
history

I believe that the purpose of mythology that is not illustrated by the story of Arachne is religion. Literature is definitely the purpose, because the story was rewritten by Ovid, so it appears in literature. History is also a part of it, because it tells the historical circumstances. Explanation of natural phenomena is illustrated in the story, because it gives a mythological explanation of how spiders were created.