B
It’s showing the definition of the word, so therefor it’s B
Because she doesn’t understand how they do it
Epistolary form is the art of moving the story forward with letters. Novels written in this form usually incorporate "letters" between characters that show what the story is like. It needs not necessarily be letters and can include news paper articles or similar. An example of such a novel would be Bram Stoker's Dracula.
So, what is the question being asked here? Is it for us to actually write a letter. Or is it for us to answer?