What is the author's purpose in writing this paragraph?

An author's purpose is either to persuade the reader, give an informative article for a reader, or to write an interesting story for the reader's enjoyment.

moon-letters were a method of writing invented by the dwarves. moon-letters were ordinary runes, but written in such a way that they could only be read when the light of the moon shone behind the writing. some moon-letters could be read by any moonlight, but it was possible to make the writing even more secret. more sophisticated moon-letters could only be read by the light of the same shape of moon, or at the same time of year, as when they were written. hope this !

the answer is d. she became an english professor at university of georgia.