I don't exactly get what you are saying, so I'm practically guessing. If you restate I will gladly help you.
I'd say letter choice C... and i luv moonlight sonota btw! <3
I can say that it depends on what you're writing like if you're writing a song then maybe you can search "Historical Songs" in the search engine and that may help you. I hope this helps.
Because it gives them a sort of “authority” making others believe that they are the truthful ones and nobody else can be.